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BUSINESS COMBINATIONS - Schedule of Unaudited Pro forma Combined Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Combinations [Abstract] |  |  |
Revenue | $ 602,754 | $ 572,628 | $ 556,569
Operating (loss) income | (12,314) | 45,257 | 31,940
Net loss attributable to common stockholders | $ (21,647) | $ (6,685) | $ (12,947)
Basic net loss per common share attributable to common stockholders (in dollars per share) | $ (0.52) | $ (0.16) | $ (0.32)
Diluted net loss per common share attributable to common stockholders (in dollars per share) | $ (0.52) | $ (0.16) | $ (0.32)
Basic and diluted weighted average shares outstanding (in shares) | 41,846 | 41,233 | 40,642

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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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