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Discontinued Operations - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Discontinued Operations And Disposal Groups [Abstract]            
Impairment loss   $ 2,300,000     $ 2,300,000  
Operating income (loss) from discontinued operations $ (21,000) $ (84) $ (268) $ (215,000) $ (373,000) $ (350,000)
Operating assets sales agreement effective date         Aug. 14, 2014  
Minimum lease period with option to purchase.         1 year