Quarterly Financial Information - Schedule of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Net revenue	$ 233,977	$ 225,392	$ 211,913	$ 191,698	$ 191,499	$ 181,579	$ 159,693	$ 129,948	$ 862,980	$ 662,719	$ 518,020
Gross profit	68,354	67,260	62,243	54,591	54,468	53,417	46,282	34,126	252,448	188,293	140,052
Net income	11,081	11,549	9,993	5,813	9,287	9,481	6,507	1,242	38,436	26,517	13,932
Net income attributable to common stockholders	$ 11,081	$ 11,549	$ 9,993	$ 5,813	$ 9,287	$ 9,481	$ 6,507	$ 1,242	$ 38,436	$ 26,517	$ (5,965)
Net income per share (basic and diluted):
Income per share attributable to common stockholders	$ 0.35	$ 0.37	$ 0.32	$ 0.19	$ 0.30	$ 0.30	$ 0.21	$ 0.04	$ 1.23	$ 0.85	$ (0.20)