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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 |  |

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