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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Class A Common Stock [Member]        
Numerator:        
Allocation of net (loss) income $ (625) $ (1,858) $ (15,476) $ 2,282
Denominator:        
Weighted-average shares outstanding 22,686 21,705 22,651 21,625
Basic (loss) earnings per share $ (0.03) $ (0.09) $ (0.68) $ 0.11
Numerator:        
Allocation of net (loss) income $ (625) $ (1,858) $ (15,476) $ 2,282
Denominator:        
Number of shares used in basic computation 22,686 21,705 22,651 21,625
Weighted-average shares effect of dilutive securities        
Director and employee stock options   792   937
Number of shares used in diluted computation 22,686 22,497 22,651 22,562
Diluted (loss) earnings per share $ (0.03) $ (0.08) $ (0.68) $ 0.10
Class B Common Stock [Member]        
Numerator:        
Allocation of net (loss) income $ (165) $ (461) $ (3,492) $ 504
Denominator:        
Weighted-average shares outstanding 5,577 5,577 5,577 5,577
Basic (loss) earnings per share $ (0.03) $ (0.08) $ (0.63) $ 0.09
Numerator:        
Allocation of net (loss) income $ (165) $ (461) $ (3,492) $ 504
Denominator:        
Number of shares used in basic computation 5,577 5,577 5,577 5,577
Weighted-average shares effect of dilutive securities        
Number of shares used in diluted computation 5,577 5,577 5,577 5,577
Diluted (loss) earnings per share $ (0.03) $ (0.08) $ (0.63) $ 0.09