Earnings Per Share (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 164,031	$ 102,859	$ 77,916
Denominator:
Weighted average shares of common stock outstanding	11,705	11,771	11,771
Effect of dilutive common stock equivalents	108	79	346
Weighted average shares of common stock outstanding	11,813	11,850	12,117
Basic earnings per share
Earnings per share, basic (in usd per share)	$ 14.01	$ 8.74	$ 6.62
Diluted earnings per share
Earnings per share, diluted (in usd per share)	$ 13.89	$ 8.68	$ 6.43