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Stock-Based Compensation - Effect of Recording Stock-Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 27,262	$ 24,378	$ 25,228
Windfall tax effect on stock-based compensation	(8,277)	(11,071)
Net effect on net income	$ 18,985	$ 13,307	$ 25,228
Basic	$ 0.35	$ 0.25	$ 0.47
Diluted	$ 0.35	$ 0.24	$ 0.47
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 24,883	$ 22,428	$ 23,302
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	98	529	700
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 2,281	$ 1,421	$ 1,226

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