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Discontinued Operations - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net cash proceeds from sale of dicountinued operations   $ 1,058,000
Discontinued operations, net carrying value of liabilities net of goodwill 435,000 435,000
Net gain from sale of discontinued operations $ 1,492,000 $ 1,492,000