Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Detail)

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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Combinations [Abstract]        
Revenues $ 2,656,348 $ 2,323,996 $ 5,077,992 $ 4,627,463
Gross profit 333,371 334,454 636,226 633,461
Selling, general and administrative expenses 206,104 208,437 422,537 415,863
Amortization of intangible assets 10,507 10,740 21,168 21,665
Net income 74,706 66,371 113,610 116,797
Net income attributable to common stock $ 74,365 $ 65,848 $ 112,272 $ 116,101
Earnings per share attributable to common stock: basic (in usd per share) $ 0.49 $ 0.42 $ 0.72 $ 0.73
Earnings per share attributable to common stock: diluted (in usd per share) $ 0.48 $ 0.41 $ 0.72 $ 0.73