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Computation of Earnings Per Share - Summary of Calculation of Basic Earnings Per Common Share and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net income	$ 28,454	$ 28,111	$ 37,073	$ 22,259	$ 56,565	$ 59,332
Denominator:
Denominator for basic earnings per share–weighted average common shares	26,134		25,958		26,102	25,915
Effect of dilutive stock options	77		107		87	116
Effect of other common stock equivalents	358		341		354	342
Denominator for diluted earnings per share–adjusted weighted average common shares	26,569		26,406		26,543	26,373
Basic Earnings Per Share	$ 1.09		$ 1.43		$ 2.17	$ 2.29
Diluted Earnings Per Share	$ 1.07		$ 1.40		$ 2.13	$ 2.25

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