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Earnings (Loss) Per Share - Components of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 19,137	$ 5,681	$ 18,621	$ 17,506
Weighted-average number of common shares outstanding - basic (shares)	31,477,591	31,154,292	31,434,371	31,101,037
Share-based compensation plans (shares)	148,180	471,449	191,298	446,985
Weighted-average number of common shares - diluted (shares)	31,625,771	31,625,741	31,625,669	31,548,022
Basic earnings (loss) per common share (usd per share)	$ 0.61	$ 0.18	$ 0.59	$ 0.56
Diluted earnings (loss) per common share (usd per share)	$ 0.61	$ 0.18	$ 0.59	$ 0.55

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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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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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