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Earnings per Share (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net income	$ 5,967,000	$ 5,933,000
Denominator:
Weighted average shares of common stock outstanding	13,160,294	13,809,130
Effect of dilutive common stock equivalents	87,862	104,213
Weighted average diluted common shares outstanding	13,248,156	13,913,343
EPS:
Basic	$ 0.45	$ 0.43
Diluted	$ 0.45	$ 0.43

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