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Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 11,825	$ 20,527
Weighted-average number of common shares outstanding - basic (shares)	31,047,191	31,424,496
Share-based compensation plans (shares)	435,676	840,561
Warrants (shares)	0	8,916
Weighted-average number of common shares - diluted (shares)	31,482,867	32,273,973
Basic earnings per common share (usd per share)	$ 0.38	$ 0.65
Diluted earnings per common share (usd per share)	$ 0.38	$ 0.64

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