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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator for basic and diluted earnings per share:
Net income	$ 31,999	$ 39,161	$ 59,347	$ 76,986
Denominator:
Weighted-average basic common shares outstanding (in shares)	38,402	38,390	38,462	38,416
Assumed conversion of dilutive securities:
Stock awards (in shares)	1,411	1,834	1,344	1,834
Denominator for diluted earnings per share - Adjusted weighted-average shares (in shares)	39,813	40,224	39,806	40,250
Earnings per common share:
Basic (usd per share)	$ 0.83	$ 1.02	$ 1.54	$ 2.00
Diluted (usd per share)	$ 0.80	$ 0.97	$ 1.49	$ 1.91

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Numerator of Basic and Diluted Earnings Per Share [Abstract]

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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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