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Quarterly Financial Data - Consolidated Operating Results by Quarter (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interim Reporting [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,673,342 | $ 1,532,001 | $ 1,386,162 | $ 1,328,764 | $ 1,393,004 | $ 1,112,674 | $ 904,781 | $ 783,305 | $ 5,920,269 | $ 4,193,764 | $ 3,629,433
Gross profit | 286,739 | 252,000 | 212,904 | 186,064 | 179,291 | 172,055 | 140,795 | 69,575 | 937,707 | 561,716 | 589,521
Net income | 102,009 | 100,856 | 69,797 | 49,994 | 70,808 | 55,600 | 34,313 | (16,305) | 322,656 | 144,416 | 155,557
Net income attributable to common stock | 98,986 | 96,398 | 65,538 | 45,707 | 66,314 | 51,994 | 31,801 | (17,594) | 306,629 | 132,515 | 153,176
Net income from continuing operations | $ 102,350 | $ 83,628 | $ 57,918 | $ 45,798 | $ 58,715 | $ 44,256 | $ 28,674 | $ (13,134) | $ 289,694 | $ 118,511 | $ 142,693
Continuing operations - Basic | $ 0.48 | $ 0.39 | $ 0.27 | $ 0.22 | $ 0.28 | $ 0.21 | $ 0.13 | $ (0.06) | $ 1.36 | $ 0.56 | $ 0.68
Continuing operations - Diluted | $ 0.48 | $ 0.39 | $ 0.27 | $ 0.22 | $ 0.28 | $ 0.21 | $ 0.13 | $ (0.06) | $ 1.36 | $ 0.56 | $ 0.67

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