Cover [Abstract] Document Information [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock [Member] Common Stock Common Stock Common Class B [Member] Class B Common Stock Document Information [Line Items] Entity Address, Postal Zip Code City Area Code Trading Symbol Security Exchange Name Title of 12(b) Security Entity Common Stock, Shares Outstanding Entity Shell Company Entity File Number Entity Incorporation, State or Country Code Document Annual Report Document Transition Report Entity Address, State or Province Entity Tax Identification Number Entity Address, Address Line One Current Fiscal Year End Date Amendment Flag Document Fiscal Year Focus Entity Well-known Seasoned Issuer Document Type Document Period End Date Entity Registrant Name Document Fiscal Period Focus Local Phone Number Entity Address, Address Line Two Entity Central Index Key Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Address, City or Town Entity Public Float ICFR Auditor Attestation Flag Auditor Firm ID Auditor Name Auditor Location Income Statement [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net income Net income Revenues Revenues Net Income (Loss) Attributable to Parent Net income attributable to Watsco, Inc. Net income attributable to Watsco, Inc. shareholders Net income attributable to Watsco, Inc. shareholders Selling, General and Administrative Expense Selling, general and administrative expenses Selling, general and administrative expense Cost of Goods and Services Sold Cost of sales Interest Income (Expense), Net Interest expense, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income taxes Income (Loss) from Equity Method Investments Other income Other income from investment in unconsolidated entity Income Tax Expense (Benefit) Income taxes Income tax expense Income tax benefit Gross Profit Gross profit Net Income (Loss) Attributable to Noncontrolling Interest Less: net income attributable to non-controlling interest Operating Income (Loss) Operating income Earnings Per Share [Abstract] Earnings per share for Common and Class B common stock: Earnings Per Share, Diluted Diluted Diluted earnings per share for Common and Class B common stock Earnings Per Share, Basic Basic Basic earnings per share for Common and Class B common stock Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement of Comprehensive Income [Abstract] Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to Watsco, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Less: comprehensive income attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive (loss) income, net of tax Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Reclassification of loss (gain) on cash flow hedging instruments into earnings Reclassification of loss (gain) on cash flow hedging instruments into earnings, net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax Unrealized gain on cash flow hedging instruments Unrealized gain on cash flow hedging instruments, net of tax Other Comprehensive Income (Loss), Net of Tax Other comprehensive (loss) income Other comprehensive gain (loss) Statement of Financial Position [Abstract] Assets [Abstract] ASSETS Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Intangible assets, net Equity Method Investments Investment in unconsolidated entity Other Assets, Noncurrent Other assets Operating Lease, Right-of-Use Asset Operating lease right-of-use assets ROU assets Operating lease ROU assets Goodwill Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Assets Total assets Assets, Current [Abstract] Current assets: Assets, Current Total current assets Other Assets, Current Other current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Inventory, Net Inventories, net Accounts Receivable, Net, Current Accounts receivable, net Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Deferred Income Taxes and Other Liabilities, Noncurrent Deferred income taxes and other liabilities Liabilities, Current [Abstract] Current liabilities: Liabilities, Current Total current liabilities Long-term Debt and Capital Lease Obligations, Current Current portion of long-term obligations Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses and other current liabilities Line of Credit, Current Borrowings under revolving credit agreement (Note 8) Borrowings under revolving credit agreement, Current Stockholders' Equity Attributable to Parent [Abstract] Watsco, Inc. shareholders' equity: Treasury Stock, Value Treasury stock, at cost, 4,823,988 shares of Common stock and 48,263 shares of Class B common stock at both December 31, 2022 and 2021, respectively Stockholders' Equity Attributable to Parent Total Watsco, Inc. shareholders' equity Retained Earnings (Accumulated Deficit) Retained earnings Common Stock, Value, Issued Common stock Preferred Stock, Value, Issued Preferred stock, $0.50 par value, 10,000,000 shares authorized; no shares issued Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss, net of tax Beginning balance Ending balance Additional Paid in Capital, Common Stock Paid-in capital Long-term Debt and Capital Lease Obligations [Abstract] Long-term obligations: Finance Lease, Liability, Noncurrent Finance lease liabilities, net of current portion Long-term Debt and Capital Lease Obligations Total long-term obligations Operating Lease Liabilities Net Of Current Portion Operating lease liabilities, net of current portion Operating lease liabilities net of current portion. Long-term Line of Credit, Noncurrent Borrowings under revolving credit agreement (Note 8) Borrowings under revolving credit agreement Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total shareholders' equity Beginning balance Ending balance Commitments and Contingencies Commitments and contingencies Liabilities and Equity Total liabilities and shareholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Non-controlling interest Treasury Stock, Shares Treasury stock, shares Common Stock, Shares, Outstanding Common stock, shares outstanding Common Stock, Par or Stated Value Per Share Common stock, par value Preferred Stock, Shares Issued Preferred stock, shares issued Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred Stock, Par or Stated Value Per Share Preferred stock, par value Common Stock, Shares Authorized Common stock, shares authorized Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-in Capital [Member] Paid-In Capital Noncontrolling Interest [Member] Non-controlling Interest Common Stock Class B Common Stock And Preferred Stock [Member] Common Stock, Class B Common Stock and Preferred Stock Common Stock Class B Common Stock And Preferred Stock [Member] Treasury Stock [Member] Treasury Stock Retained Earnings [Member] Retained Earnings AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss Makdad Industrial Supply Co Inc [Member] NS Supply of FishkillInc [Member] N&S Supply of Fishkill, Inc. [Member] N&S Supply of Fishkill, Inc Acme Refrigeration of Baton Rouge LLC [Member] Acme Refrigeration of Baton Rouge LLC Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions to non-controlling interest Contribution From Non Controlling Interest For Investment In Consolidated Entity Investment in TEC Distribution LLC Contribution from non controlling interest for investment in consolidated entity. Stock Issued During Period, Value, Restricted Stock Award, Gross Issuances of restricted shares of common stock Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation Stock Issued During Period, Value, Employee Benefit Plan Common stock contribution to 401(k) plan Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Forfeitures of restricted shares of common stock (in shares) Dividends, Common Stock, Cash Cash dividends declared and paid on Common and Class B common stock Stock Issuances From Exercise Of Stock Options And Employee Stock Purchase Plan Shares Stock issuances from exercise of stock options and employee stock purchase plan (in shares) Stock issuances from exercise of stock options and employee stock purchase plan. Shares, Outstanding Ending balance (in shares) Beginning balance (in shares) Stock Repurchased and Retired During Period, Shares Retirement of common stock (in shares) Stock Repurchased and Retired During Period, Value Retirement of common stock Stock Issued During Period, Shares, Employee Benefit Plan Common stock contribution to 401(k) plan (in shares) Common stock contribution to 401(k) Plan, shares Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Forfeitures of restricted shares of common stock Stock Issued During Period, Shares, Acquisitions Common stock issued (in shares) Stock Issuances From Exercise Of Stock Options And Employee Stock Purchase Plan Value Stock issuances from exercise of stock options and employee stock purchase plan Stock Issuances From Exercise Of Stock Options And Employee Stock Purchase Plan Value Stock Issued During Period, Shares, Restricted Stock Award, Gross Issuances of restricted shares of common stock (in shares) Stock Issued During Period, Value, Acquisitions Common stock issued Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Adjustment to fair value of Common stock issued for N&S Supply of Fishkill, Inc. CommonStockReleasedFromEscrowValue Common Stock Released From Escrow Value Common stock released from escrow value. CommonStockReleasedFromEscrowShares Common Stock Released From Escrow Shares Common stock released from escrow shares. Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Temperature Equipment Corporation [Member] TEC Distribution LLC [Member] Temperature Equipment Corporation. Common Stock, Dividends, Per Share, Declared Cash dividends declared and paid, common stock Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, net of effects of acquisitions: Increase (Decrease) in Other Operating Assets and Liabilities, Net Other, net Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and other liabilities Increase (Decrease) in Accounts Receivable Accounts receivable, net Increase (Decrease) in Inventories Inventories, net Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Deferred Income Tax Expense (Benefit) Deferred income tax provision Deferred Depreciation, Depletion and Amortization Depreciation and amortization Gain (Loss) on Disposition of Property Plant Equipment (Gain) loss on sale of property and equipment Non Cash Contribution To 401 K Plan Non-cash contribution to 401(k) plan Amount of non-cash discretionary contribution made by an employer to a defined contribution plan. Share-based Compensation Share-based compensation Provision for Doubtful Accounts Provision for doubtful accounts Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Issuance of Common Stock Net proceeds from issuances of common stock Payments Related to Tax Withholding for Share-based Compensation Repurchases of common stock to satisfy employee withholding tax obligations Payment, tax withholding, share-based payment arrangement Payments of Ordinary Dividends, Common Stock Dividends on Common and Class B common stock Net Repayments Of Finance Lease Liabilities Net repayments of finance lease liabilities Net repayments of finance lease liabilities. Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Payments of Debt Issuance Costs Payment of fees related to revolving credit agreement Payment of fees related to revolving credit agreement Payments of Ordinary Dividends, Noncontrolling Interest Distributions to non-controlling interest Proceeds From Non Controlling Interest For Investment In Consolidated Entity Proceeds from non-controlling interest for investments Proceeds from non controlling interest for investment in consolidated entity Net (Repayments) Proceeds Under Revolving Credit Agreement Net (repayments) proceeds under revolving credit agreement Net (repayments) proceeds under revolving credit agreement. Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net increase (decrease) in cash and cash equivalents Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Proceeds from Sale of Equity Securities, FV-NI Proceeds from sale of equity securities Payments to Acquire Property, Plant, and Equipment Capital expenditures Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property and equipment Payments to Acquire Businesses, Net of Cash Acquired Business acquisitions, net of cash acquired Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities PaymentToAcquirePrivateEquities Other investment Payment to acquire private equities. Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Effect of foreign exchange rate changes on cash and cash equivalents TEC Distribution LLC [Member] TEC Distribution LLC [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Accounting Policies [Abstract]