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Quarterly Financial Data (Unaudited) - 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, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,817,623 | $ 1,645,132 | $ 1,474,377 | $ 1,585,710 | $ 1,673,342 | $ 1,532,001 | $ 1,386,162 | $ 1,328,764 | $ 6,522,842 | $ 5,920,269 | $ 4,193,764
Gross profit | 302,843 | 273,053 | 241,284 | 238,273 | 286,739 | 252,000 | 212,904 | 186,064 | 1,055,453 | 937,707 | 561,716
Net income | 171,317 | 98,409 | 74,726 | 76,857 | 102,009 | 100,856 | 69,797 | 49,994 | 421,309 | 322,656 | 144,416
Net income attributable to common stock | 166,697 | 92,906 | 70,237 | 72,081 | 98,986 | 96,398 | 65,538 | 45,707 | 401,921 | 306,629 | 132,515
Net income from continuing operations | $ 166,697 | $ 92,906 | $ 70,237 | $ 72,081 | $ 102,350 | $ 83,628 | $ 57,918 | $ 45,798 | $ 401,921 | $ 289,694 | $ 118,511
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 0.77 | $ 0.43 | $ 0.33 | $ 0.34 | $ 0.48 | $ 0.39 | $ 0.27 | $ 0.22 | $ 1.87 | $ 1.36 | $ 0.56

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