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Acquisitions - Unaudited Supplemental ProForma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Business Combinations [Abstract] |  |  |  |
Revenues | $ 1,792,430 | $ 1,916,000 | $ 3,513,472 | $ 3,835,457
Gross profit | 200,217 | 235,282 | 403,682 | 484,237
Selling, general and administrative expenses | 156,607 | 154,023 | 315,817 | 305,998
Amortization of intangible assets | 8,141 | 9,910 | 15,792 | 19,648
Net income from continuing operations | 16,729 | 37,053 | 37,069 | 91,347
Net income from continuing operations attributable to common stock | $ 16,562 | $ 33,597 | $ 36,539 | $ 83,190
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 0.11 | $ 0.16 | $ 0.23 | $ 0.39

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- Definition The pro forma amortization of intangible assets for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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