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Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 4,139	$ 18,655	$ 46,378	$ 52,975
Weighted-average number of common shares outstanding - basic (shares)	30,739,671	27,367,551	30,597,314	27,131,960
Share-based compensation plans (shares)	1,754,480	2,205,291	2,004,917	2,119,717
Warrants (shares)	18,541	124,365	24,392	243,531
Weighted-average number of common shares - diluted (shares)	32,512,692	29,697,207	32,626,623	29,495,208
Basic earnings per common share (usd per share)	$ 0.13	$ 0.68	$ 1.52	$ 1.95
Diluted earnings per common share (usd per share)	$ 0.13	$ 0.63	$ 1.42	$ 1.80

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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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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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