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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
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to Watsco, Inc. shareholders	$ 23,048us-gaap_NetIncomeLoss	$ 16,753us-gaap_NetIncomeLoss
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock	1,868us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1,242us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Earnings allocated to Watsco, Inc. shareholders - basic	21,180us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	15,511us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding - Basic	32,377,159us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	32,249,988us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share for Common and Class B common stock	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic
Net income attributable to Watsco, Inc. shareholders	23,048us-gaap_NetIncomeLoss	16,753us-gaap_NetIncomeLoss
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock	1,868us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	1,242us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted
Earnings allocated to Watsco, Inc. shareholders - diluted	21,180us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	15,511us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted-average common shares outstanding - Basic	32,377,159us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	32,249,988us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock options	53,918us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	55,457us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average common shares outstanding - Diluted	32,431,077us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	32,305,445us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share for Common and Class B common stock	$ 0.65us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted
Common Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Earnings allocated to Watsco, Inc. shareholders - basic	19,409us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	14,211us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementEquityComponentsAxis = 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	$ 1,771us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ 1,300us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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