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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 2,478,627 $ 2,609,307 $ 2,200,374 $ 2,178,170 $ 2,102,966 $ 2,042,186 $ 1,792,430 $ 1,713,737 $ 9,466,478 $ 7,651,319 $ 7,572,436
Gross profit 322,876 350,631 302,165 266,188 307,688 302,582 200,217 203,313 1,241,860 1,013,800 923,665
Net income 115,576 89,849 64,360 48,440 88,358 74,152 16,729 20,859 318,225 200,098 321,824
Net income attributable to common stock 113,561 89,313 63,837 48,267 87,583 73,742 16,562 20,496 314,978 198,383 310,907
Net income from continuing operations attributable to common stock $ 113,561 $ 89,313 $ 63,837 $ 48,267 $ 88,530 $ 73,137 $ 16,562 $ 20,496 $ 314,978 $ 198,725 $ 120,286
Basic earnings per share from continuing operations attributable to common stock (in usd per share) $ 0.72 $ 0.57 $ 0.41 $ 0.31 $ 0.57 $ 0.47 $ 0.11 $ 0.13 $ 2.02 $ 1.26 $ 0.62
Diluted earnings per share from continuing operations attributable to common stock (in usd per share) $ 0.72 $ 0.56 $ 0.41 $ 0.31 $ 0.57 $ 0.47 $ 0.11 $ 0.13 $ 2.00 $ 1.26 $ 0.62