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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 4,152	$ 22,049	$ 15,455	$ 48,197
Less: Income distributed to participating securities	(539)	(507)	(1,622)	(1,091)
Less: Undistributed income allocable to participating securities		(1,719)	(18)	(2,518)
Net income available to common stockholders	$ 3,613	$ 19,823	$ 13,815	$ 44,588
Weighted average common shares (in thousands)	151,897	150,892	151,782	145,149
Basic earnings per share	$ 0.02	$ 0.13	$ 0.09	$ 0.31
Net income	$ 4,152	$ 22,049	$ 15,455	$ 48,197
Weighted average common shares	151,897	150,892	151,782	145,149
Dilutive effect of common stock equivalents	15,266	15,730	15,162	10,435
Weighted average diluted shares	167,163	166,622	166,944	155,584
Diluted earnings per share	$ 0.02	$ 0.13	$ 0.09	$ 0.31

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