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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 2,200,374 | $ 1,792,430 | $ 4,378,544 | $ 3,506,167
Gross profit | 302,165 | 200,217 | 568,353 | 403,530
Selling, general and administrative expenses | 185,880 | 156,607 | 370,432 | 315,131
Amortization of intangible assets | 6,494 | 8,141 | 13,056 | 15,636
Net income | 64,360 | 16,729 | 112,800 | 37,588
Net income attributable to common stock | $ 63,837 | $ 16,562 | $ 112,104 | $ 37,058
Earnings per share attributable to common stock - basic and diluted (in usd per share) | $ 0.41 | $ 0.11 | $ 0.72 | $ 0.23
Pro Forma | Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 2,203,724 | $ 1,806,214 | $ 4,386,919 | $ 3,541,361
Gross profit | 303,222 | 203,354 | 570,996 | 410,576
Selling, general and administrative expenses | 186,512 | 158,603 | 372,012 | 319,799
Amortization of intangible assets | 6,729 | 8,683 | 13,644 | 16,866
Net income | 64,472 | 17,080 | 113,074 | 38,298
Net income attributable to common stock | $ 63,949 | $ 16,913 | $ 112,378 | $ 37,768
Earnings per share attributable to common stock - basic and diluted (in usd per share) | $ 0.41 | $ 0.11 | $ 0.72 | $ 0.24

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References No definition available. + Details
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