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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
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