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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Combinations [Abstract] |  |  |
Revenues | $ 7,677,293 | $ 7,770,744 | $ 8,476,584
Gross profit | 1,017,506 | 956,925 | 1,248,827
Selling, general and administrative expenses | 656,109 | 612,979 | 745,321
Amortization of intangible assets | 32,204 | 39,947 | 47,777
Net income from continuing operations | 200,675 | 136,608 | 303,772
Net income from continuing operations attributable to common stock | $ 198,960 | $ 125,691 | $ 285,404
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 1.26 | $ 0.64 | $ 1.28

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