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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 16,724	$ 12,105	$ 26,148	$ 18,985
Less: Income distributed to participating securities	(513)	(178)	(584)	(348)
Less: Undistributed income allocable to participating securities	(1,101)	(19)	(999)
Net income available to common stockholders	$ 15,110	$ 11,908	$ 24,565	$ 18,637
Weighted average common shares (in thousands)	149,056	134,557	142,230	134,472
Basic earnings per share	$ 0.10	$ 0.09	$ 0.17	$ 0.14
Net income	$ 16,724	$ 12,105	$ 26,148	$ 18,985
Weighted average common shares	149,056	134,557	142,230	134,472
Dilutive effect of common stock equivalents	14,290	1,017	7,749	1,141
Weighted average diluted shares	163,346	135,574	149,979	135,613
Diluted earnings per share	$ 0.10	$ 0.09	$ 0.17	$ 0.14

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The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned.

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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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