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Investments (Investment in Joint Venture) - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Schedule of Investments [Line Items]      
Maximum exposure loss relating to VIE   $ 4,746,000 $ 4,477,000
Undistributed loss from equity method investment   (24,000) $ (23,000)
Distribution   $ 0  
Joint Venture [Member]      
Schedule of Investments [Line Items]      
Additional cash contribution to joint venture $ 270,000