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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
Minimum Distribution Percentage of Taxable Income to Qualify for Real Estate Investment Trust |  |  | 90.00% |  |
TCJA enacted date |  |  | Dec. 22, 2017 |  |
U.S. federal corporate tax rate |  |  | 21.00% | 21.00% | 35.00%
TCJA one time transition tax |  |  | $ 0 |  |
Effect of change in income tax associated with the ACT | $ 1,000,000.0 | $ 4,500,000 |  |  |
Effective tax rate |  |  | 4.00% | 5.00% | 7.20%
Liabilities for uncertain tax positions |  |  | $ 0 | $ 0 |

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- Definition Minimum distribution percentage of taxable income to qualify for real estate investment trust. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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