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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Class A Common Stock [Member]                      
Basic and diluted (loss) earnings per share:                      
Allocation of net (loss) income                 $ (26,691) $ 5,879 $ 24,885
Number of shares used in basic computation                 22,705 21,799 20,917
Weighted-average effect of dilutive securities                      
Add: Director and employee stock options                   843 613
Number of shares used in per share computations                 22,705 22,642 21,530
Weighted-average shares outstanding                 22,705 21,799 20,917
Numerator:                      
Allocation of net (loss) income                 $ (26,691) $ 5,879 $ 24,885
Denominator:                      
Weighted-average shares outstanding                 22,705 21,799 20,917
Basic (loss) earnings per share $ (0.53) $ 0.04 $ (0.03) $ (0.66) $ (0.10) $ 0.27 $ (0.09) $ 0.19 $ (1.18) $ 0.27 $ 1.19
Denominator:                      
Diluted (loss) earnings per share (0.53) 0.04 (0.03) (0.66) (0.10) 0.26 (0.08) 0.18 $ (1.18) $ 0.26 $ 1.16
Class B Common Stock [Member]                      
Basic and diluted (loss) earnings per share:                      
Allocation of net (loss) income                 $ (6,069) $ 1,237 $ 5,916
Number of shares used in basic computation                 5,577 5,577 5,577
Weighted-average effect of dilutive securities                      
Weighted-average shares outstanding                 5,577 5,577 5,577
Basic and diluted (loss) earnings per share $ (0.50) $ 0.04 $ (0.03) $ (0.60) $ (0.11) $ 0.24 $ (0.08) $ 0.17 $ (1.09) $ 0.22 $ 1.06
Denominator:                      
Weighted-average shares outstanding                 5,577 5,577 5,577
Basic (loss) earnings per share                 $ (1.09) $ 0.22 $ 1.06
Denominator:                      
Diluted (loss) earnings per share                 $ (1.09) $ 0.22 $ 1.06