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Earnings Per Share - Computation of Basic Earnings and Diluted Earnings Per Share Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 31,552	$ 38,924	$ 39,161	$ 37,825	$ 66,196	$ 38,836	$ 31,770	$ 32,769	$ 147,462	$ 169,571	$ 113,701
Weighted-average basic common shares outstanding									38,445	37,273	36,448
Stock options									1,678	1,973	2,513
Denominator for diluted earnings per share - Adjusted weighted-average shares	39,891	40,528	40,224	39,836	39,499	39,342	39,201	38,932	40,123	39,246	38,961
Basic (USD per share)									$ 3.84	$ 4.55	$ 3.12
Diluted (USD per share)	$ 0.79	$ 0.96	$ 0.97	$ 0.95	$ 1.68	$ 0.99	$ 0.81	$ 0.84	$ 3.68	$ 4.32	$ 2.92

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