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Schedule of Basic and Diluted Earnings per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net income attributable to Watsco, Inc. shareholders $ 24,072us-gaap_NetIncomeLoss $ 54,461us-gaap_NetIncomeLoss $ 56,101us-gaap_NetIncomeLoss $ 16,753us-gaap_NetIncomeLoss $ 17,321us-gaap_NetIncomeLoss $ 45,699us-gaap_NetIncomeLoss $ 51,318us-gaap_NetIncomeLoss $ 13,385us-gaap_NetIncomeLoss $ 151,387us-gaap_NetIncomeLoss $ 127,723us-gaap_NetIncomeLoss $ 103,334us-gaap_NetIncomeLoss
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock                 11,444us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic 9,064us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic 17,656us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Earnings allocated to Watsco, Inc. shareholders - basic                 139,943us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 118,659us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 85,678us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding - Basic                 32,308,073us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,195,598us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 31,680,187us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share for Common and Class B common stock $ 0.69us-gaap_EarningsPerShareBasic [1] $ 1.56us-gaap_EarningsPerShareBasic [1] $ 1.60us-gaap_EarningsPerShareBasic [1] $ 0.48us-gaap_EarningsPerShareBasic [1] $ 0.50us-gaap_EarningsPerShareBasic [1] $ 1.32us-gaap_EarningsPerShareBasic [1] $ 1.48us-gaap_EarningsPerShareBasic [1] $ 0.39us-gaap_EarningsPerShareBasic [1] $ 4.33us-gaap_EarningsPerShareBasic [1] $ 3.69us-gaap_EarningsPerShareBasic [1] $ 2.70us-gaap_EarningsPerShareBasic
Net income attributable to Watsco, Inc. shareholders 24,072us-gaap_NetIncomeLoss 54,461us-gaap_NetIncomeLoss 56,101us-gaap_NetIncomeLoss 16,753us-gaap_NetIncomeLoss 17,321us-gaap_NetIncomeLoss 45,699us-gaap_NetIncomeLoss 51,318us-gaap_NetIncomeLoss 13,385us-gaap_NetIncomeLoss 151,387us-gaap_NetIncomeLoss 127,723us-gaap_NetIncomeLoss 103,334us-gaap_NetIncomeLoss
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock                 11,435us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted 9,053us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted 17,656us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted
Earnings allocated to Watsco, Inc. shareholders - diluted                 139,952us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 118,670us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 85,678us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted-average common shares outstanding - Basic                 32,308,073us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 32,195,598us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 31,680,187us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock options                 50,781us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 62,470us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 64,212us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average common shares outstanding - Diluted                 32,358,854us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 32,258,068us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 31,744,399us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share for Common and Class B common stock $ 0.69us-gaap_EarningsPerShareDiluted [1] $ 1.56us-gaap_EarningsPerShareDiluted [1] $ 1.60us-gaap_EarningsPerShareDiluted [1] $ 0.48us-gaap_EarningsPerShareDiluted [1] $ 0.50us-gaap_EarningsPerShareDiluted [1] $ 1.32us-gaap_EarningsPerShareDiluted [1] $ 1.48us-gaap_EarningsPerShareDiluted [1] $ 0.39us-gaap_EarningsPerShareDiluted [1] $ 4.32us-gaap_EarningsPerShareDiluted [1] $ 3.68us-gaap_EarningsPerShareDiluted [1] $ 2.70us-gaap_EarningsPerShareDiluted
Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - basic                 128,214us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 108,690us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 78,359us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Class B Common Stock                      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings allocated to Watsco, Inc. shareholders - basic                 $ 11,729us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 9,969us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 7,319us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
[1] Quarterly and year-to-date earnings per share are calculated on an individual basis; therefore, the sum of earnings per share amounts for the quarters may not equal earnings per share amounts for the year.