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Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Watsco, Inc. shareholders | $ 13,380 |  | $ 33,547 |  | $ 36,023 |  | $ 7,500 |  | $ 10,445 |  | $ 31,437 |  | $ 35,045 |  | $ 3,833 |  | $ 90,450 |  | $ 80,760 |  | $ 43,314
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,045 |  | 4,775 |  | 3,320
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,405 |  | 75,985 |  | 39,994
Weighted-average Common and Class B common shares outstanding for basic earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,678,206 |  | 30,467,212 |  | 28,223,275
Basic earnings per share for Common and Class B common stock | $ 0.39 | [1] | $ 1.02 | [1] | $ 1.09 | [1] | $ 0.21 | [1] | $ 0.31 | [1] | $ 0.97 | [1] | $ 1.08 | [1] | $ 0.10 | [1] | $ 2.75 | [1] | $ 2.49 | [1] | $ 1.42
Less: distributed and undistributed earnings allocated to non-vested (restricted) common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,042 |  | 4,772 |  | 3,320
Earnings allocated to Watsco, Inc. shareholders - diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,408 |  | 75,988 |  | 39,994
Effect of dilutive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,085 |  | 111,396 |  | 298,162
Weighted-average Common and Class B common shares outstanding for diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,753,291 |  | 30,578,608 |  | 28,521,437
Diluted earnings per share for Common and Class B common stock | $ 0.39 | [1] | $ 1.02 | [1] | $ 1.09 | [1] | $ 0.21 | [1] | $ 0.31 | [1] | $ 0.97 | [1] | $ 1.08 | [1] | $ 0.10 | [1] | $ 2.74 | [1] | $ 2.49 | [1] | $ 1.40
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,574 |  | 68,856 |  | 35,963
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings allocated to Watsco, Inc. shareholders - basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,831 |  | $ 7,129 |  | $ 4,031
[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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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 20 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 7 -Paragraph 18 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256 + Details
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