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Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income from continuing operations available to common shareholders	$ 25,337	$ 19,712	$ 48,647	$ 37,734
Net loss from discontinued operations	(5,230)	(2,291)	(6,407)	(3,415)
Net income available to common shareholders	$ 20,107	$ 17,421	$ 42,240	$ 34,319
Weighted-average number of common shares outstanding - basic (shares)	30,641,554	27,080,676	30,524,955	27,012,869
Share-based compensation plans (shares)	1,910,634	2,123,745	2,129,773	2,077,219
Warrants (shares)	17,464	299,908	27,318	303,769
Weighted-average number of common shares - diluted (shares)	32,569,652	29,504,329	32,682,046	29,393,857
Basic earnings per common share from continuing operations (usd per share)	$ 0.83	$ 0.73	$ 1.59	$ 1.40
Basic loss per common share from discontinued operations (usd per share)	(0.17)	(0.09)	(0.21)	(0.13)
Basic earnings per common share (usd per share)	0.66	0.64	1.38	1.27
Diluted earnings per common share from continuing operations (usd per share)	0.78	0.67	1.49	1.28
Diluted loss per common share from discontinued operations (usd per share)	(0.16)	(0.08)	(0.20)	(0.11)
Diluted earnings per common share (usd per share)	$ 0.62	$ 0.59	$ 1.29	$ 1.17

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