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Quarterly Financial Data (Unaudited) - Consolidated Operating Results by Quarter (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,899,272 | $ 1,939,438 | $ 1,872,340 | $ 1,861,386 | $ 2,027,614 | $ 2,145,958 | $ 1,838,209 | $ 1,735,448 | $ 7,572,436 | $ 7,747,229 | $ 6,411,577
Gross profit | 223,039 | 235,215 | 227,505 | 237,906 | 311,628 | 336,903 | 264,209 | 256,054 | 923,665 | 1,168,794 | 986,933
Net income (loss) | (4,882) | 218,956 | 49,565 | 58,185 | 70,975 | 100,015 | 85,444 | 58,648 | 321,824 | 315,082 | 421,309
Net income (loss) attributable to common stock | (5,074) | 216,388 | 46,109 | 53,484 | 66,576 | 94,648 | 81,082 | 54,408 | 310,907 | 296,714 | 401,921
Net income (loss) from continuing operations attributable to common stock | $ (2,586) | $ 43,176 | $ 32,007 | $ 47,689 | $ 60,406 | $ 87,923 | $ 73,453 | $ 47,442 | $ 120,286 | $ 269,224 | $ 372,057
Earnings (loss) per share from continuing operations attributable to common stock - basic and diluted | $ (0.02) | $ 0.23 | $ 0.15 | $ 0.22 | $ 0.27 | $ 0.40 | $ 0.33 | $ 0.22 | $ 0.62 | $ 1.22 | $ 1.73

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