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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, 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

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