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Selected Quarterly Financial Data (Unaudited) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 133,531 $ 119,693 $ 117,737 $ 115,366 $ 131,917 $ 122,152 $ 120,602 $ 122,967 $ 486,327 $ 497,638 $ 503,843
Gross profit 108,895 95,878 92,387 89,193 106,032 98,763 95,562 97,782 386,353 398,139 407,194
Net income (loss) $ 12,167 $ 9,700 $ 20,394 $ (7,906) $ 3,301 $ 12,699 $ 4,828 $ 1,673 $ 34,355 $ 22,501 $ 18,195
Earnings (loss) per share:                      
Basic $ 1.19 [1] $ 0.95 [1] $ 1.99 [1] $ (0.77) [1] $ 0.30 [1] $ 1.11 [1] $ 0.42 [1] $ 0.15 [1] $ 3.35 [1],[2] $ 1.98 [1],[2] $ 1.59 [2]
Diluted $ 1.18 [1] $ 0.94 [1] $ 1.98 [1] $ (0.77) [1] $ 0.30 [1] $ 1.10 [1] $ 0.42 [1] $ 0.15 [1] $ 3.33 [1],[2] $ 1.97 [1],[2] $ 1.58 [2]
[1] The sum of the basic and diluted earnings (loss) per share for the four quarters may differ from annual earnings per share as the weighted average shares outstanding are computed independently for each of the quarters presented.
[2] Basic and fully diluted earnings per share for class A and class B common stock are the same.