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 $)
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