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Earnings Per Share (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 41,063	$ 18,477
Denominator:
Weighted average shares of common stock outstanding	11,772	11,772
Effect of dilutive common stock equivalents	109	52
Weighted average shares of common stock outstanding	11,881	11,824
Basic earnings per share
Earnings per share - basic	$ 3.49	$ 1.57
Diluted earnings per share
Earnings per share - diluted	$ 3.46	$ 1.56

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