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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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