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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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 36,633	$ 27,199	$ 26,155
Less: Income distributed to participating securities	(1,595)	(696)	(773)
Less: Undistributed income allocable to participating securities	(1,409)
Net income available to common stockholders	$ 33,629	$ 26,503	$ 25,382
Weighted average common shares (in thousands)	146,645	134,614	134,401
Basic earnings per share	$ 0.23	$ 0.20	$ 0.19
Net income	$ 36,633	$ 27,199	$ 26,155
Weighted average common shares	146,645	134,614	134,401
Dilutive effect of common stock equivalents	11,770	1,389	1,138
Weighted average diluted shares	158,415	136,003	135,539
Diluted earnings per share	$ 0.23	$ 0.20	$ 0.19

X

- Definition

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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