Earnings Per Share - Computation of Basic and Diluted Net Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income	$ 75,219	$ 64,516	$ 119,296	$ 52,153	$ 57,355	$ 91,930	$ 259,031	$ 201,438
Denominator:
Basic weighted average shares outstanding	57,825			57,865			57,871	57,949
Diluted weighted average shares outstanding	57,966			58,033			58,056	58,193
Earnings per share:
Earnings per share, basic	$ 1.3			$ 0.9			$ 4.48	$ 3.48
Earnings per share, diluted	$ 1.3			$ 0.9			$ 4.46	$ 3.46
Restricted Stock Units [Member]
Denominator:
Dilutive effect of unvested restricted stock and restricted stock units	141			168			185	244