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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Data [Abstract]                      
Net revenue $ 353,121 $ 348,999 $ 332,584 $ 301,728 $ 299,869 $ 295,193 $ 282,196 $ 255,669 $ 1,336,432 $ 1,132,927 $ 862,980
Gross profit 98,638 97,334 95,643 79,976 81,345 85,581 84,928 72,172 371,591 324,026 252,448
Net income 16,476 15,563 16,315 6,394 10,793 12,010 11,973 6,364 54,748 41,140 38,436
Comprehensive income $ 12,973 $ 16,381 $ 16,790 $ 7,554 $ 11,345 $ 12,042 $ 11,896 $ 6,364 $ 53,698 $ 41,647 $ 38,436
Basic net income per share $ 0.54 $ 0.50 $ 0.52 $ 0.20         $ 1.76 $ 1.30 $ 1.23
Basic and diluted net income per share         $ 0.34 $ 0.38 $ 0.38 $ 0.20   1.30  
Diluted net income per share $ 0.53 $ 0.50 $ 0.52 $ 0.20         $ 1.75 $ 1.30 $ 1.23