Business Combinations - Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Net revenue	$ 896,853	$ 786,144	$ 637,434
Net income	39,752	29,463	15,219
Net income (loss) attributable to common stockholders	$ 39,752	$ 29,463	$ (4,678)
Net income (loss) per share attributable to common stockholders (basic and diluted)	$ 1.27	$ 0.94	$ (0.16)
Series A Redeemable Preferred Stock [Member]
Business Acquisition [Line Items]
Accretion charges on Series A Redeemable Preferred Stock			$ (19,897)