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
Mar. 31, 2017
Mar. 31, 2016
Business Acquisition [Line Items]    
Revenues $ 2,178,170 $ 1,713,737
Gross profit 266,188 203,313
Selling, general and administrative expenses 184,552 158,524
Amortization of intangible assets 6,562 7,495
Net income 48,440 20,859
Net income attributable to common stock $ 48,267 $ 20,496
Earnings per share attributable to common stock - basic and diluted $ 0.31 $ 0.13
Pro Forma [Member] | Acquisitions [Member]    
Business Acquisition [Line Items]    
Revenues   $ 1,730,177
Gross profit   205,205
Selling, general and administrative expenses   160,230
Amortization of intangible assets   7,824
Net income   20,757
Net income attributable to common stock   $ 20,394
Earnings per share attributable to common stock - basic and diluted   $ 0.13