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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Numerator:
Net income available to common shareholders	$ 23,402	$ 17,553
Denominator:
Basic weighted average shares outstanding	29,697,722	31,683,672
Effect of dilutive securities:
Diluted weighted average shares outstanding	29,860,730	32,094,828
Basic earnings per share	$ 0.79	$ 0.55
Diluted earnings per share	$ 0.78	$ 0.55
Stock Appreciation Rights and Options [Member]
Effect of dilutive securities:
Dilutive securities	107,755	240,066
Restricted Stock [Member]
Effect of dilutive securities:
Dilutive securities	55,253	171,090

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- 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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