Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Deposits within financial institutions	$ 250,000		$ 250,000
Goodwill	98,682,000		98,682,000		$ 98,682,000
Goodwill impairment			0		$ 0
Food and beverage revenue	$ 62,526,000	$ 64,798,000	115,247,000	$ 120,575,000
Number of operating segment | Segment	1
Lease discount rate						4.50%
Right-of-use asset	$ 600,000		600,000
Food and Beverage [Member]
Property, Plant and Equipment [Line Items]
Food and beverage revenue	1,700,000	$ 1,900,000	3,300,000	$ 4,000,000
Accounting Standards Update 2016-02 [Member]
Property, Plant and Equipment [Line Items]
Operating lease liability	700,000		700,000
Right-of-use asset	$ 700,000		$ 700,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets			39 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Percentage of adjusted taxable income to be distributed to stockholder			90.00%
Minimum [Member] | Land and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets			10 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets			3 years
Maximum [Member] | Land and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets			15 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets			7 years