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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 39,161	$ 31,770	$ 76,986	$ 64,539
Weighted-average basic common shares outstanding (in shares)	38,390	37,154	38,416	37,144
Stock options (in shares)	1,834	2,047	1,834	2,067
Denominator for diluted earnings per share - Adjusted weighted-average shares (in shares)	40,224	39,201	40,250	39,211
Basic (USD per share)	$ 1.02	$ 0.86	$ 2.00	$ 1.74
Diluted (USD per share)	$ 0.97	$ 0.81	$ 1.91	$ 1.65

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