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Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 20,527	$ 22,132
Weighted-average number of common shares outstanding - basic (shares)	31,424,496	30,407,060
Share-based compensation plans (shares)	840,561	2,344,929
Warrants (shares)	8,916	37,171
Weighted-average number of common shares - diluted (shares)	32,273,973	32,789,160
Basic earnings per common share (usd per share)	$ 0.65	$ 0.73
Diluted earnings per common share (usd per share)	$ 0.64	$ 0.67

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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 call options and warrants using the treasury stock method.

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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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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