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Computation of Basic and Diluted EPS (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income	$ 2,813,000	$ 5,944,000	$ 6,804,000	$ 12,302,000
Denominator:
Weighted average shares of common stock outstanding	13,747,000	14,175,990	13,711,961	14,219,532
Effect of dilutive common stock equivalents	87,264	285,326	67,634	270,227
Weighted average diluted common shares outstanding	13,834,264	14,461,316	13,779,595	14,489,759
EPS:
Basic	$ 0.20	$ 0.42	$ 0.50	$ 0.87
Diluted	$ 0.20	$ 0.41	$ 0.49	$ 0.85

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