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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
Mar. 31, 2020
Mar. 31, 2019
Class A Common Stock [Member]    
Numerator:    
Allocation of net income (loss) $ 3,064 $ 18,843
Denominator:    
Weighted-average shares outstanding 23,260 22,850
Basic earnings (loss) per share $ 0.13 $ 0.82
Numerator:    
Allocation of net income (loss) $ 3,064 $ 18,843
Denominator:    
Number of shares used in basic computation 23,260 22,850
Weighted-average shares effect of dilutive securities:    
Director and employee stock options 188 71
Number of shares used in diluted computation 23,448 22,921
Diluted earnings (loss) per share $ 0.13 $ 0.82
Class B Common Stock [Member]    
Numerator:    
Allocation of net income (loss) $ 667 $ 4,180
Denominator:    
Weighted-average shares outstanding 5,577 5,577
Basic earnings (loss) per share $ 0.12 $ 0.75
Numerator:    
Allocation of net income (loss) $ 667 $ 4,180
Denominator:    
Number of shares used in basic computation 5,577 5,577
Weighted-average shares effect of dilutive securities:    
Director and employee stock options 0  
Number of shares used in diluted computation 5,577 5,577
Diluted earnings (loss) per share $ 0.12 $ 0.75