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Selected Quarterly Financial Data (Unaudited) (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 Information Disclosure [Abstract]                      
Revenues $ 138,145 $ 125,212 $ 120,610 $ 120,576 $ 140,108 $ 129,896 $ 123,142 $ 119,015 $ 504,543 $ 512,161 $ 529,869
Gross profit 113,392 100,823 96,235 97,444 116,820 106,961 99,041 96,192 407,894 419,014 428,761
Net (loss) income $ (26,224) $ 17,924 $ 11,076 $ 14,867 $ 31,124 $ 26,628 $ 18,884 $ 14,272 $ 17,643 $ 90,908 $ 105,931
Earnings (loss) per share:                      
Basic $ (2.29) [1] $ 1.57 [1] $ 0.97 [1] $ 1.30 [1] $ 2.72 [1] $ 2.33 [1] $ 1.65 [1] $ 1.25 [1] $ 1.54 [1],[2] $ 7.96 [1],[2] $ 9.33 [2]
Diluted $ (2.29) [1] $ 1.56 [1] $ 0.96 [1] $ 1.28 [1] $ 2.69 [1] $ 2.31 [1] $ 1.64 [1] $ 1.24 [1] $ 1.53 [1],[2] $ 7.89 [1],[2] $ 9.18 [2]
[1] The sum of the basic and diluted (loss) earnings 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.