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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash | $ 6,665,000 |  | $ 6,665,000 |  | $ 5,518,000
Bad debt expense | 101,000 | $ 306,000 | 670,000 | $ 727,000 |
Amortization expense for intangible assets | 416,000 | 0 | 664,000 | 3,735,000 |
Additional amortization expense on current in-place intangible assets | 795,000 |  | 795,000 |  |
Depreciation expense | 8,255,000 | 7,765,000 | 23,625,000 | 23,192,000 |
Advertising expenses | 437,000 | 435,000 | 1,285,000 | 1,325,000 |
Property management expenses | 1,328,000 | 1,219,000 | 4,310,000 | 3,710,000 |
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 | 1,933,000 | $ 0 | 5,491,000 |
Natural Disasters and Other Insurable Events |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Rent revenue recognized | 11,000 | $ 38,000 | $ 96,000 | $ 151,000 |
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 | $ 1,034,000 |  | $ 1,963,000 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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