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Quarterly Financial Information - Schedule of Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data [Abstract]                      
Net revenue $ 299,869 $ 295,193 $ 282,196 $ 255,669 $ 233,977 $ 225,392 $ 211,913 $ 191,698 $ 1,132,927 $ 862,980 $ 662,719
Gross profit 81,345 85,581 84,928 72,172 68,354 67,260 62,243 54,591 324,026 252,448 188,293
Net income 10,793 12,010 11,973 6,364 11,081 11,549 9,993 5,813 41,140 38,436 26,517
Comprehensive income $ 11,345 $ 12,042 $ 11,896 $ 6,364 $ 11,081 $ 11,549 $ 9,993 $ 5,813 $ 41,647 $ 38,436 $ 26,517
Basic and diluted net income per share $ 0.34 $ 0.38 $ 0.38 $ 0.20 $ 0.35 $ 0.37 $ 0.32 $ 0.19 $ 1.30 $ 1.23 $ 0.85