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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Federal Deposit Insurance Corporation deposit insurance limit per institution | $ 250,000 |  | $ 250,000 |  |  |
Restricted cash | 8,960,000 |  | 8,960,000 |  |  | $ 6,729,000
Amortization expense for intangible assets | 307,000 | $ 567,000 | 1,157,000 | $ 2,900,000 |  |
Additional amortization expense on current in-place intangible assets | 276,000 |  | 276,000 |  |  |
Write-off of amortized intangible assets | 0 | 1,641,000 | 1,532,000 | 4,155,000 |  |
Depreciation expense | 13,127,000 | 10,216,000 | 37,445,000 | 30,690,000 |  |
Uncollectible rental revenue | 285,000 |  | 819,000 |  |  |
Bad debt expense |  | 236,000 |  | 286,000 |  |
Advertising expenses | 612,000 | 577,000 | 1,763,000 | 1,674,000 |  |
Transfers of assets between Level 1 and Level 2 | 0 |  | 0 |  |  |
Transfers of assets between Level 2 and Level 1 | 0 |  | 0 |  |  |
Transfers of liabilities between Level 1 and Level 2 | 0 |  | 0 |  |  |
Transfers of liabilities between Level 2 and Level 1 | 0 |  | 0 |  |  |
Income tax expense | 0 | 0 | $ 0 | 0 |  |
Taxable income distributable to stockholders |  |  | 90.00% |  |  |
Cumulative-effect adjustment |  |  | $ 0 |  |  |
Topic 842 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Right-of-use assets | $ 2,928,000 |  | $ 2,928,000 |  | $ 308,000 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | us-gaap:OtherAssets |  | us-gaap:OtherAssets |  |  |
Lease liability | $ 3,206,000 |  | $ 3,206,000 |  | $ 308,000 |
Operating Lease, Liability, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilities |  | us-gaap:OtherLiabilities |  |  |
Total operating lease expense | $ 154,000 |  | $ 433,000 |  |  |
Natural Disasters and Other Insurable Events |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Rent revenue recognized | 80,000 | $ 65,000 | $ 103,000 | $ 171,000 |  |
Building and Building Improvements |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Depreciable Lives |  |  | 40 years |  |  |
Leases Acquired In Place |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Acquisition of above-market in-place leases | $ 448,000 |  | $ 764,000 |  |  |
Minimum | Equipment and Fixtures |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Depreciable Lives |  |  | 5 years |  |  |
Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents original maturity period |  |  | 3 months |  |  |
Maximum | Topic 842 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease term | 10 years |  | 10 years |  |  |
Maximum | Equipment and Fixtures |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Depreciable Lives |  |  | 10 years |  |  |

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