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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |  |
Revenues | $ 7,635,932 | $ 8,476,584 | $ 7,629,310
Gross profit | 939,452 | 1,248,827 | 1,185,691
Selling, general and administrative expenses | 600,057 | 745,321 | 563,877
Amortization of intangible assets | 36,479 | 47,777 | 50,755
Net income from continuing operations | 135,467 | 303,772 | 451,399
Net income from continuing operations attributable to common stock | $ 124,550 | $ 285,404 | $ 432,011
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 0.64 | $ 1.28 | $ 1.95

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