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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Earnings Loss Per Share [Line Items]                      
Continuing operations, net of tax                 $ 105,931 $ 5,035 $ 26,550
Discontinued operations, net of tax                 0 0 56,782
Net income (loss) $ 39,111 $ 23,893 $ 22,467 $ 20,460 $ 22,699 $ (845) $ (10,337) $ (6,482) $ 105,931 $ 5,035 $ 83,332
Total weighted average common stock shares outstanding                 11,355 11,301 11,300
Employee stock options                 184 55 1
Adjusted weighted average shares                 11,539 11,356 11,301
Basic earnings per share                      
From continuing operations                 $ 9.33 $ 0.45 $ 2.35
From discontinued operations                 0.00 0.00 5.02
Basic earnings per share $ 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 earnings per share:                      
From continuing operations                 9.18 0.44 2.35
From discontinued operations                 0.00 0.00 5.02
Diluted earnings per share $ 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]
Class A                      
Earnings Loss Per Share [Line Items]                      
Total weighted average common stock shares outstanding                 9,320 9,246 9,073
Class B Convertible                      
Earnings Loss Per Share [Line Items]                      
Total weighted average common stock shares outstanding                 2,035 2,055 2,227
[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.