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Investments (Real Estate Investments) - Additional Information (Detail)
3 Months Ended 6 Months Ended 9 Months Ended
Aug. 16, 2016
USD ($)
Sep. 30, 2016
USD ($)
Restaurant
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Restaurant
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Restaurant
Dec. 31, 2015
USD ($)
Restaurant
Schedule of Investments [Line Items]              
Real estate investments           $ 10,200,000  
Maximum exposure loss relating to VIE   $ 4,940,000   $ 4,940,000   4,940,000 $ 4,787,000
ADC Arrangement [Member]              
Schedule of Investments [Line Items]              
Real estate investments $ 10,200,000            
Accrued investment income $ 74,000            
Maximum exposure loss relating to VIE             10,200,000
Credit loss allowances   $ 0   $ 0   $ 0 $ 0
Real Estate Investments [Member]              
Schedule of Investments [Line Items]              
Number of restaurants | Restaurant   1   1   1 1
Depreciation and amortization expenses under real estate investments   $ 126,000 $ 87,000 $ 314,000 $ 280,000