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Earnings per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
Earnings per Share (Detail) (USD $)	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:
Net income	$ 5,720,000	$ 7,073,000	$ 11,687,000	$ 13,006,000
Denominator:
Weighted average shares of common stock outstanding	13,050,346	13,863,043	13,111,348	13,836,087
Effect of dilutive common stock equivalents	99,068	100,014	88,859	159,084
Weighted average diluted common shares outstanding	13,149,414	13,963,057	13,200,207	13,995,171
EPS:
Basic	$ 0.44	$ 0.51	$ 0.89	$ 0.94
Diluted	$ 0.44	$ 0.51	$ 0.89	$ 0.93

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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