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Earnings Per Share - Summary of Reconciliation of Numerators and Denominators Used in Basic and Diluted Per Share Computations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Class A Common Stock [Member]                      
Numerator:                      
Allocation of net income (loss)                 $ 38,718 $ (26,691) $ 5,879
Denominator:                      
Weighted-average shares outstanding                 22,986 22,705 21,799
Basic earnings (loss) per share $ 0.50 $ 0.19 $ 0.17 $ 0.82 $ (0.53) $ 0.04 $ (0.03) $ (0.66) $ 1.68 $ (1.18) $ 0.27
Numerator:                      
Allocation of net income (loss)                 $ 38,718 $ (26,691) $ 5,879
Denominator:                      
Number of shares used in basic computation                 22,986 22,705 21,799
Weighted-average shares effect of dilutive securities                      
Director and employee stock options                 211   843
Number of shares used in diluted computation                 23,197 22,705 22,642
Diluted earnings (loss) per share         (0.53) 0.04 (0.03) (0.66) $ 1.67 $ (1.18) $ 0.26
Class B Common Stock [Member]                      
Denominator:                      
Weighted-average shares outstanding                 5,577 5,577 5,577
Basic earnings (loss) per share                 $ 1.51 $ (1.09) $ 0.22
Numerator:                      
Allocation of net income (loss)                 $ 8,434 $ (6,069) $ 1,237
Denominator:                      
Number of shares used in basic computation                 5,577 5,577 5,577
Weighted-average shares effect of dilutive securities                      
Diluted earnings (loss) per share 0.50 0.18 0.17 0.82         $ 1.51 $ (1.09) $ 0.22
Basic and diluted (loss) earnings per share $ 0.45 $ 0.16 $ 0.15 $ 0.75 $ (0.50) $ 0.04 $ (0.03) $ (0.60) $ 1.51 $ (1.09) $ 0.22