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Acquisitions - Unaudited Supplemental Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Business Combinations [Abstract] |  |
Revenues | $ 2,421,644 | $ 2,303,467
Gross profit | 302,890 | 299,110
Selling, general and administrative expenses | 216,396 | 207,315
Amortization of intangible assets | 10,661 | 10,926
Net income | 39,050 | 50,851
Net income attributable to common stock | $ 38,053 | $ 50,678
Earnings per share from continuing operations: basic (in usd per share) | $ 0.24 | $ 0.32
Earnings per share from continuing operations: diluted (in usd per share) | $ 0.24 | $ 0.32

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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