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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Business Combinations [Abstract] |  |  |  |
Revenues | $ 1,864,550 | $ 1,672,112 | $ 3,632,181 | $ 3,458,655
Gross profit | 281,448 | 280,479 | 553,452 | 558,385
Selling, general and administrative expenses | 139,440 | 133,381 | 313,994 | 261,588
Amortization of intangible assets | 8,615 | 8,175 | 16,969 | 17,456
Net income | 85,444 | 88,151 | 143,127 | 178,094
Net income attributable to common stock | $ 81,082 | $ 83,662 | $ 134,525 | $ 168,829
Earnings per share attributable to common stock - basic and diluted | $ 0.37 | $ 0.38 | $ 0.61 | $ 0.77

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