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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |
Federal Deposit Insurance Corporation deposit insurance limit per institution | $ 250,000 |  | $ 250,000 |  |
Restricted cash | 7,051,000 |  | 7,051,000 |  | $ 4,634,000
Bad debt expense | (115,000) | $ 255,000 | 49,000 | $ 569,000 |
Amortization expense for intangible assets | 1,044,000 | 193,000 | 2,336,000 | 248,000 |
Additional amortization expense on current in-place intangible assets | 325,000 |  | 325,000 |  |
Write-off intangible assets | 0 | 0 | 1,963,000 | 0 |
Depreciation expense | 10,539,000 | 7,818,000 | 20,471,000 | 15,370,000 |
Recognized contract assets | 0 |  | 0 |  |
Recognized contract liabilities | 0 |  | 0 |  |
Advertising expenses | 564,000 | 423,000 | 1,097,000 | 848,000 |
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% |  |
ASC Topic 230 |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Decrease in net cash used in investing activities due to new accounting standard adoption |  |  |  | 172,000 |
Natural Disasters and Other Insurable Events |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Rent revenue recognized | 64,000 | $ 34,000 | $ 106,000 | $ 85,000 |
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 | $ 0 |  | $ 1,641,000 |  |
Minimum | Equipment and Fixtures |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Depreciable Lives |  |  | 5 years |  |
Maximum |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Cash And Cash Equivalents Maturity Period |  |  | 3 months |  |
Maximum | Equipment and Fixtures |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |
Depreciable Lives |  |  | 10 years |  |

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