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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Loss Per Share [Line Items]                      
Net income $ 2,661 $ (14,229) $ 3,387 $ 657 $ 12,167 $ 9,700 $ 20,394 $ (7,906) $ (7,524) $ 34,355 $ 22,501
Total weighted average common stock shares outstanding                 9,684 10,256 11,375
Adjusted weighted average shares                 9,684 10,328 11,412
Earnings per share:                      
Basic earnings per share $ 0.28 [1] $ (1.48) [1] $ 0.35 [1] $ 0.07 [1] $ 1.19 [1] $ 0.95 [1] $ 1.99 [1] $ (0.77) [1] $ (0.78) [1],[2] $ 3.35 [1],[2] $ 1.98 [2]
Diluted earnings per share $ 0.27 [1] $ (1.48) [1] $ 0.35 [1] $ 0.07 [1] $ 1.18 [1] $ 0.94 [1] $ 1.98 [1] $ (0.77) [1] $ (0.78) [1],[2] $ 3.33 [1],[2] $ 1.97 [2]
Share-based Payment Arrangement, Option                      
Earnings Loss Per Share [Line Items]                      
Dilutive securities (in shares)                 0 72 37
Class A                      
Earnings Loss Per Share [Line Items]                      
Net income                 $ 0 $ 0 $ 0
Total weighted average common stock shares outstanding                 7,658 8,221 9,340
Class B Convertible                      
Earnings Loss Per Share [Line Items]                      
Net income                 $ 0 $ 0 $ 0
Total weighted average common stock shares outstanding                 2,026 2,035 2,035
[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 (loss) earnings per share for class A and class B common stock are the same.