Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail)

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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Business Combinations [Abstract]        
Revenues $ 1,873,169 $ 2,034,146 $ 3,749,834 $ 3,968,023
Gross profit 227,739 284,616 469,840 560,434
Selling, general and administrative expenses 150,128 146,302 298,208 326,760
Amortization of intangible assets 8,743 11,066 17,283 22,298
Net income from continuing operations 35,481 82,014 88,720 136,523
Net income from continuing operations attributable to common stock $ 32,025 $ 77,652 $ 80,563 $ 127,921
Earnings per share from continuing operations attributable to common stock - basic and diluted $ 0.15 $ 0.35 $ 0.38 $ 0.57