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Earnings (Loss) Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 47,085	$ 23,451	$ 65,706	$ 40,957
Weighted-average number of common shares outstanding - basic (shares)	31,517,504	31,223,777	31,462,284	31,142,400
Share-based compensation plans (shares)	218,807	420,951	203,743	438,629
Weighted-average number of common shares - diluted (shares)	31,736,311	31,644,728	31,666,027	31,581,029
Basic earnings (loss) per common share (usd per share)	$ 1.49	$ 0.75	$ 2.09	$ 1.32
Diluted earnings (loss) per common share (usd per share)	$ 1.48	$ 0.74	$ 2.07	$ 1.30

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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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