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Earnings per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
Earnings per Share (Detail) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:
Net income	$ 4,855,000	$ 5,673,000	$ 16,542,000	$ 18,679,000
Denominator:
Weighted average shares of common stock outstanding	12,457,438	13,884,293	12,877,297	13,852,155
Effect of dilutive common stock equivalents	111,949	19,119	98,374	103,062
Weighted average shares of common stock outstanding	12,569,387	13,903,412	12,975,671	13,955,217
EPS:
Basic	$ 0.39	$ 0.41	$ 1.28	$ 1.35
Diluted	$ 0.39	$ 0.41	$ 1.27	$ 1.34

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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- Definition

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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- Definition

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

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