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Summary of Selected Financial Information of the Company on a Pro Forma Basis (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition Pro Forma Information [Abstract] |  |
Revenues | $ 2,738,579 | $ 1,567,141
Net income (loss) | $ 29,584 | $ (505,413)
Net income (loss) per share |  |
Basic | $ 0.13 | $ (2.30)
Diluted | $ 0.13 | $ (2.30)

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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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