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Earnings and Dividends per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Basic net income and earnings per share, Numerator (Income)	$ 3,036	$ 5,804	$ 8,560	$ 12,954
Diluted earnings and earnings per share, Numerator (Income)	$ 3,036	$ 5,804	$ 8,560	$ 12,954
Basic net income and earnings per share, Denominator (Shares)	34,518,622	33,983,708	34,403,720	33,952,768
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan, Denominator (Shares)	103,000	371,000	261,000	258,000
Diluted earnings and earnings per share, Denominator (Shares)	34,621,883	34,354,687	34,665,053	34,211,067
Basic net income and earnings per share, Per Share Amount	$ 0.09	$ 0.17	$ 0.25	$ 0.38
Diluted earnings and earnings per share, Per Share Amount	$ 0.09	$ 0.17	$ 0.25	$ 0.38

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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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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