Earnings per Share (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Numerator:
Income from continuing operations	$ 4,416,000	$ 6,545,000
Income (loss) from discontinued operations	28,000	(578,000)
Net income	$ 4,444,000us-gaap_NetIncomeLoss	$ 5,967,000us-gaap_NetIncomeLoss
Denominator:
Weighted average shares of common stock outstanding	12,108,202	13,160,294
Effect of dilutive common stock equivalents	88,592	87,862
Weighted average shares of common stock outstanding	12,196,794	13,248,156
Basic earnings per share
Earnings per share from continuing operations	$ 0.36	$ 0.49
Earnings (loss) per share from discontinued operations	$ 0.00	$ (0.04)
Earnings per share	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic
Diluted earnings per share
Earnings per share from continuing operations	$ 0.36	$ 0.49
Earnings (loss) per share from discontinued operations	$ 0.00	$ (0.04)
Earnings per share	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted

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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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