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BUSINESS COMBINATIONS - Schedule of Unaudited Pro forma Combined Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Combinations [Abstract]        
Revenue $ 151,133 $ 147,008 $ 422,059 $ 408,946
Operating income 17,378 12,617 34,868 26,926
Net income (loss) attributable to common stockholders $ 7,537 $ 2,249 $ 5,078 $ (6,093)
Basic earnings per share attributable to common stockholders (in USD per share) $ 0.18 $ 0.06 $ 0.12 $ (0.15)
Basic weighted average common shares outstanding (in shares) 41,377 40,810 41,169 40,560
Diluted earnings per share attributable to common stockholders (in USD per share) $ 0.18 $ 0.05 $ 0.12 $ (0.15)
Diluted weighted average common shares outstanding (in shares) 42,287 41,283 41,896 40,560