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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Accounting Policies [Line Items] |  |  |
Federal Deposit Insurance Corporation deposit insurance limit per institution | $ 250,000 |  |
Restricted cash | 6,729,000 | $ 4,634,000 |
Bad debt expense | 644,000 | 870,000 | $ 975,000
Amortization expense for intangible assets | 3,429,000 | 1,536,000 | 3,735,000
Write-off of amortized intangible assets | 4,153,000 | 0 | 0
Amortization expense for intangible assets expected for 2019 | 744,000 |  |
Depreciation expense | 41,792,000 | 32,665,000 | 31,089,000
Write-off of fully depreciated fixed assets | 408,000 |  |
Recognized contract assets | 0 |  |
Recognized contract liabilities | 0 |  |
Advertising expenses | 2,172,000 | 1,806,000 | 1,749,000
Income tax expense | $ 0 | $ 0 | $ 0
Taxable income distributable to stockholders | 90.00% |  |
Dividends characterized as capital gain distribution | 37.00% | 53.00% |
Dividends characterized as ordinary income percentage | 39.00% | 36.00% |
Dividends characterized as return of capital | 24.00% | 11.00% | 7.00%
Dividends characterized as ordinary taxable income |  |  | 93.00%
ASC Topic 230 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Increase (decrease) in net cash used in investing activities due to new accounting standard adoption |  | $ 942,000 | $ (105,000)
Natural Disasters and Other Insurable Events |  |  |
Significant Accounting Policies [Line Items] |  |  |
Rent revenue recognized | $ 195,000 | 110,000 |
North Carolina |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 14.93% |  |
Tennessee |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 11.21% |  |
Georgia |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 10.95% |  |
Kentucky |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 9.76% |  |
South Carolina |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 8.73% |  |
Ohio |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 8.20% |  |
Texas |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of rental revenue | 7.87% |  |
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 | $ 3,074,000 | $ 2,515,000 |
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 | Equipment and Fixtures |  |  |
Significant Accounting Policies [Line Items] |  |  |
Depreciable Lives | 10 years |  |

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