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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 61,798	$ 38,263	$ 31,578	$ 32,306	$ 31,196	$ 35,430	$ 25,007	$ 18,224	$ 163,945	$ 109,857	$ 64,869
Weighted-average basic common shares outstanding									37,273	36,448	34,137
Stock options									1,973	2,513	2,415
Denominator for diluted earnings per share - Adjusted weighted-average shares	39,499	39,342	39,201	38,932	38,975	39,062	38,738	39,071	39,246	38,961	36,552
Basic (USD per share)									$ 4.40	$ 3.01	$ 1.90
Diluted (USD per share)	$ 1.56	$ 0.97	$ 0.81	$ 0.83	$ 0.80	$ 0.91	$ 0.65	$ 0.47	$ 4.18	$ 2.82	$ 1.77

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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