Earnings per Share (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Income from continuing operations	$ 21,029,000	$ 27,135,000	$ 18,442,000
Loss from discontinued operations	(7,848,000)	(3,166,000)	(2,566,000)
Net income	$ 13,181,000us-gaap_NetIncomeLoss	$ 23,969,000us-gaap_NetIncomeLoss	$ 15,876,000us-gaap_NetIncomeLoss
Denominator:
Weighted average shares of common stock outstanding	12,670,387	13,774,083	13,721,997
Effect of dilutive common stock equivalents	107,890	43,610	17,827
Weighted average shares of common stock outstanding	12,778,277	13,817,693	13,739,824
Basic earnings per share
Earnings per share from continuing operations	$ 1.66	$ 1.97	$ 1.34
Loss per share from discontinued operations	$ (0.62)	$ (0.23)	$ (0.18)
Earnings per share	$ 1.04us-gaap_EarningsPerShareBasic	$ 1.74us-gaap_EarningsPerShareBasic	$ 1.16us-gaap_EarningsPerShareBasic
Diluted earnings per share
Earnings per share from continuing operations	$ 1.65	$ 1.96	$ 1.34
Loss per share from discontinued operations	$ (0.62)	$ (0.23)	$ (0.18)
Earnings per share	$ 1.03us-gaap_EarningsPerShareDiluted	$ 1.73us-gaap_EarningsPerShareDiluted	$ 1.16us-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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