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Quarterly Financial Information (unaudited) - Summary of Selected Financial Information (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
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 241,981	$ 236,067	$ 236,060	$ 221,174	$ 217,701	$ 214,706	$ 208,763	$ 199,729	$ 935,282	$ 840,899	$ 759,880
Gross profit	115,871	111,626	109,276	102,805	105,350	103,989	95,503	94,535	439,578	399,377	359,188
Income before income taxes	40,107	38,626	37,700	39,437	45,261	44,357	37,197	36,641
Net income	$ 31,552	$ 38,924	$ 39,161	$ 37,825	$ 66,196	$ 38,836	$ 31,770	$ 32,769	$ 147,462	$ 169,571	$ 113,701
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
Shares used in computing diluted earnings per share	39,891	40,528	40,224	39,836	39,499	39,342	39,201	38,932	40,123	39,246	38,961
Tax Act tax benefit									$ 1,750	$ 25,992	$ 0

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