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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 2,479	$ 16,724	$ 11,303	$ 26,148
Less: Income distributed to participating securities	(539)	(513)	(1,083)	(584)
Less: Undistributed income allocable to participating securities	0	(1,101)	(117)	(999)
Net income available to common stockholders	$ 1,940	$ 15,110	$ 10,103	$ 24,565
Weighted average common shares (in thousands)	151,818	149,056	151,722	142,230
Basic earnings per share	$ 0.01	$ 0.10	$ 0.07	$ 0.17
Net income	$ 2,479	$ 16,724	$ 11,303	$ 26,148
Weighted average common shares	151,818	149,056	151,722	142,230
Dilutive effect of common stock equivalents	15,431	14,290	15,133	7,749
Weighted average diluted shares	167,249	163,346	166,855	149,979
Diluted earnings per share	$ 0.01	$ 0.10	$ 0.07	$ 0.17

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