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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Restricted cash	$ 5,690,000		$ 5,690,000		$ 5,518,000
Bad debt expense	255,000	$ 202,000	569,000	$ 421,000
Amortization expense for intangible assets	193,000	0	248,000	3,735,000
Additional amortization expense on current in-place intangible assets	692,000		692,000
Depreciation expense	7,818,000	7,635,000	15,370,000	15,427,000
Advertising expenses	423,000	443,000	848,000	890,000
Property management expenses	1,444,000	1,229,000	2,982,000	2,491,000
Income tax expense	0	0	$ 0	0
Taxable income distributable to stockholders			90.00%
General and Administrative Expenses
Significant Accounting Policies [Line Items]
Asset management and incentive fees	0	1,863,000	$ 0	3,559,000
Natural Disasters and Other Insurable Events
Significant Accounting Policies [Line Items]
Rent revenue recognized	$ 34,000	$ 38,000	$ 85,000	$ 113,000
Building and Building Improvements
Significant Accounting Policies [Line Items]
Depreciable Lives			40 years
Minimum | Equipment and Fixtures
Significant Accounting Policies [Line Items]
Depreciable Lives			5 years
Maximum | Equipment and Fixtures
Significant Accounting Policies [Line Items]
Depreciable Lives			10 years
Leases Acquired In Place
Significant Accounting Policies [Line Items]
Acquisition of above-market in-place leases			$ 929,000

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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