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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income available to common shareholders	$ 6,898	$ 3,744	$ 53,578	$ 40,012
Denominator:
Basic weighted average shares outstanding	29,295,284	31,227,643	29,419,958	31,547,212
Effect of dilutive securities:
Diluted weighted average shares outstanding	29,457,653	31,537,010	29,581,578	31,923,255
Basic earnings per share	$ 0.24	$ 0.12	$ 1.82	$ 1.27
Diluted earnings per share	$ 0.23	$ 0.12	$ 1.81	$ 1.25
Stock Appreciation Rights and Options [Member]
Effect of dilutive securities:
Dilutive securities	81,612	182,082	95,738	216,276
Restricted Stock [Member]
Effect of dilutive securities:
Dilutive securities	80,757	127,285	65,882	159,767

X

- Definition

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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