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Earnings Per Share (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 15,902	$ 21,383	$ 20,750	$ 13,781	$ 14,133	$ 12,222	$ 58,035	$ 40,136
Denominator:
Weighted average shares of common stock outstanding	11,731			11,954			11,823	12,006
Effect of dilutive common stock equivalents	334			143			351	106
Weighted average shares of common stock outstanding	12,065			12,097			12,174	12,112
Basic earnings per share
Earnings per share	$ 1.36			$ 1.15			$ 4.91	$ 3.34
Diluted earnings per share
Earnings per share	$ 1.32			$ 1.14			$ 4.77	$ 3.31

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