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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Combinations [Abstract]        
Revenue $ 144,670 $ 144,537 $ 270,926 $ 261,939
Operating income 15,596 11,263 17,491 14,309
Net income (loss) attributable to common stockholders $ 5,195 $ 978 $ (2,460) $ (8,342)
Basic net income (loss) per share attributable to common stockholders $ 0.13 $ 0.02 $ (0.06) $ (0.21)
Basic weighted average shares outstanding 41,132 40,447 41,064 40,432
Diluted net income (loss) per share attributable to common stockholders $ 0.12 $ 0.02 $ (0.06) $ (0.21)
Diluted weighted average shares outstanding 41,598 40,846 41,064 40,432