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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 2,414	$ 4,139	$ 42,989	$ 46,378
Weighted-average number of common shares outstanding - basic (shares)	31,671,122	30,739,671	31,554,407	30,597,314
Share-based compensation plans (shares)	601,622	1,754,480	750,573	2,004,917
Warrants (shares)	4,846	18,541	7,475	24,392
Weighted-average number of common shares - diluted (shares)	32,277,590	32,512,692	32,312,455	32,626,623
Basic earnings per common share (usd per share)	$ 0.08	$ 0.13	$ 1.36	$ 1.52
Diluted earnings per common share (usd per share)	$ 0.07	$ 0.13	$ 1.33	$ 1.42

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