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Statement of Operations Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Quarterly Financial Information [Line Items]                      
Revenues $ 143,522 $ 129,536 $ 132,940 $ 123,871 $ 148,871 $ 151,202 $ 141,853 $ 137,904 $ 529,869 $ 579,830 $ 575,888
Gross profit 120,108 104,852 107,028 96,773 117,236 116,249 106,240 104,895 428,761 444,620 437,319
Net (loss) income $ 39,111 $ 23,893 $ 22,467 $ 20,460 $ 22,699 $ (845) $ (10,337) $ (6,482) $ 105,931 $ 5,035 $ 83,332
(Loss) earnings per share:                      
Basic $ 3.44 [1] $ 2.10 [1] $ 1.98 [1] $ 1.81 [1] $ 2.01 [1] $ (0.07) [1] $ (0.91) [1] $ (0.57) [1] $ 9.33 [1],[2] $ 0.45 [1],[2] $ 7.37 [2]
Diluted $ 3.38 [1] $ 2.06 [1] $ 1.95 [1] $ 1.79 [1] $ 1.99 [1] $ (0.07) [1] $ (0.91) [1] $ (0.57) [1] $ 9.18 [1],[2] $ 0.44 [1],[2] $ 7.37 [2]
[1] The sum of the basic and diluted earnings (loss) per share for the four quarters may differ from annual earnings (loss) 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.