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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, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income	$ 41,982	$ 46,963	$ 41,063	$ 34,453	$ 21,935	$ 18,477	$ 130,008	$ 74,865
Denominator:
Weighted average shares of common stock outstanding	11,692			11,766			11,739	11,772
Effect of dilutive common stock equivalents	93			91			101	68
Weighted average shares of common stock outstanding	11,785			11,857			11,840	11,840
Basic earnings per share
Earnings per share - basic	$ 3.59			$ 2.93			$ 11.07	$ 6.36
Diluted earnings per share
Earnings per share - diluted	$ 3.56			$ 2.91			$ 10.98	$ 6.32

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