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Accounting Policies - Summary of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic earnings per share
Net income	$ (10,816)	$ (12,804)
Weighted average common shares outstanding	38,822,543	38,306,395
Basic Earnings Per Share	$ 0.28	$ 0.33
Diluted earnings per share
Net income available to common shareholders	$ 10,816	$ 12,804
Weighted average common shares outstanding	38,822,543	38,306,395
Effect of dilutive securities:
Weighted average common shares outstanding	38,906,172	38,468,810
Diluted Earnings Per Share	$ 0.28	$ 0.33
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	0	35,356
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	83,629	127,059

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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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