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Income Per Common Share - Summary of Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income - basic and diluted	$ 11,973	$ 9,993	$ 18,337	$ 15,806
Weighted average number of common shares outstanding	31,646,460	31,317,632	31,618,624	31,279,935
Dilutive effect of outstanding common stock awards after application of the Treasury Stock Method	63,094	29,435	79,836	59,084
Diluted shares outstanding	31,709,554	31,347,067	31,698,460	31,339,019
Basic net income per share	$ 0.38	$ 0.32	$ 0.58	$ 0.51
Diluted net income per share	$ 0.38	$ 0.32	$ 0.58	$ 0.50

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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