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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
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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 | $ 24,072 us-gaap_NetIncomeLoss |  | $ 54,461 us-gaap_NetIncomeLoss |  | $ 56,101 us-gaap_NetIncomeLoss |  | $ 16,753 us-gaap_NetIncomeLoss |  | $ 17,321 us-gaap_NetIncomeLoss |  | $ 45,699 us-gaap_NetIncomeLoss |  | $ 51,318 us-gaap_NetIncomeLoss |  | $ 13,385 us-gaap_NetIncomeLoss |  | $ 151,387 us-gaap_NetIncomeLoss |  | $ 127,723 us-gaap_NetIncomeLoss |  | $ 103,334 us-gaap_NetIncomeLoss
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,444 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic |  | 9,064 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic |  | 17,656 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,943 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 118,659 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 85,678 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted-average common shares outstanding - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,308,073 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 32,195,598 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 31,680,187 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share for Common and Class B common stock | $ 0.69 us-gaap_EarningsPerShareBasic | [1] | $ 1.56 us-gaap_EarningsPerShareBasic | [1] | $ 1.60 us-gaap_EarningsPerShareBasic | [1] | $ 0.48 us-gaap_EarningsPerShareBasic | [1] | $ 0.50 us-gaap_EarningsPerShareBasic | [1] | $ 1.32 us-gaap_EarningsPerShareBasic | [1] | $ 1.48 us-gaap_EarningsPerShareBasic | [1] | $ 0.39 us-gaap_EarningsPerShareBasic | [1] | $ 4.33 us-gaap_EarningsPerShareBasic | [1] | $ 3.69 us-gaap_EarningsPerShareBasic | [1] | $ 2.70 us-gaap_EarningsPerShareBasic
Net income attributable to Watsco, Inc. shareholders | 24,072 us-gaap_NetIncomeLoss |  | 54,461 us-gaap_NetIncomeLoss |  | 56,101 us-gaap_NetIncomeLoss |  | 16,753 us-gaap_NetIncomeLoss |  | 17,321 us-gaap_NetIncomeLoss |  | 45,699 us-gaap_NetIncomeLoss |  | 51,318 us-gaap_NetIncomeLoss |  | 13,385 us-gaap_NetIncomeLoss |  | 151,387 us-gaap_NetIncomeLoss |  | 127,723 us-gaap_NetIncomeLoss |  | 103,334 us-gaap_NetIncomeLoss
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,435 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted |  | 9,053 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted |  | 17,656 us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted
Earnings allocated to Watsco, Inc. shareholders - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,952 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | 118,670 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | 85,678 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted-average common shares outstanding - Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,308,073 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 32,195,598 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 31,680,187 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,781 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  | 62,470 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |  | 64,212 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average common shares outstanding - Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,358,854 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 32,258,068 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 31,744,399 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share for Common and Class B common stock | $ 0.69 us-gaap_EarningsPerShareDiluted | [1] | $ 1.56 us-gaap_EarningsPerShareDiluted | [1] | $ 1.60 us-gaap_EarningsPerShareDiluted | [1] | $ 0.48 us-gaap_EarningsPerShareDiluted | [1] | $ 0.50 us-gaap_EarningsPerShareDiluted | [1] | $ 1.32 us-gaap_EarningsPerShareDiluted | [1] | $ 1.48 us-gaap_EarningsPerShareDiluted | [1] | $ 0.39 us-gaap_EarningsPerShareDiluted | [1] | $ 4.32 us-gaap_EarningsPerShareDiluted | [1] | $ 3.68 us-gaap_EarningsPerShareDiluted | [1] | $ 2.70 us-gaap_EarningsPerShareDiluted
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,214 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 108,690 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 78,359 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,729 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | $ 9,969 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  | $ 7,319 us-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.

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