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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, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Class A Common Stock [Member]
Numerator:
Allocation of net income (loss)	$ 13,482	$ 18,665	$ 22,223	$ 21,721
Denominator:
Weighted-average shares outstanding	25,342	23,451	25,057	23,356
Basic earnings (loss) per share	$ 0.53	$ 0.80	$ 0.89	$ 0.93
Numerator:
Allocation of net income (loss)	$ 13,482	$ 18,665	$ 22,223	$ 21,721
Denominator:
Number of shares used in basic computation	25,342	23,451	25,057	23,356
Weighted-average shares effect of dilutive securities
Director and employee stock options	252	199	190	193
Number of shares used in diluted computation	25,594	23,650	25,247	23,549
Diluted earnings (loss) per share	$ 0.53	$ 0.79	$ 0.88	$ 0.92
Class B Common Stock [Member]
Numerator:
Allocation of net income (loss)	$ 2,682	$ 4,014	$ 4,471	$ 4,689
Denominator:
Weighted-average shares outstanding	5,577	5,577	5,577	5,577
Basic earnings (loss) per share	$ 0.48	$ 0.72	$ 0.80	$ 0.84
Numerator:
Allocation of net income (loss)	$ 2,682	$ 4,014	$ 4,471	$ 4,689
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 earnings (loss) per share	$ 0.48	$ 0.72	$ 0.80	$ 0.84

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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