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Investments (Real Estate Investments) - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2014
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Investments [Line Items]            
Maximum exposure loss relating to VIE $ 4,477 $ 4,746     $ 4,746  
Real Estate Development [Member] | Riverview, Florida [Member]            
Schedule of Investments [Line Items]            
Deposit paid to secure right to purchase   70     70  
ADC Arrangement [Member]            
Schedule of Investments [Line Items]            
Loan amount 9,785   $ 10,200      
Maximum exposure loss relating to VIE $ 2,888 6,285     6,285  
Real Estate Investments [Member]            
Schedule of Investments [Line Items]            
Depreciation and amortization expenses under real estate investments   $ 90   $ 100 $ 193 $ 198