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Income Taxes - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Assets | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Assets
Income Taxes [Line Items] |  |  |  |
Percentage of distributed taxable income to qualify as a REIT | 90.00% |  |  |
Number of years the Company distributed sufficient taxable income in order to meet REIT distribution requirements | 3 years |  |  |
U.S. federal income taxes | $ 0 | $ 0 | $ 0 |
U.S. federal excise taxes | $ 0 | 0 | 0 |
Number of subsequent taxable years | 4 years |  |  |
Tax cost basis of assets | $ 5,000,000,000 | 9,100,000,000 |  |
Net payment | 1,100,000 | 700,000 | $ 1,000,000 |
Aggregate valuation allowance | 11,400,000 | 61,000,000 |  |
Puerto Rico [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Number of properties | Assets |  |  |  | 14
Prepaid tax asset |  | $ 4,000,000 |  | $ 16,800,000
Number of properties sold | Assets |  | 2 |  |
Prepaid tax asset released |  | $ 1,400,000 |  |
Aggregate valuation allowance | $ 4,000,000 | $ 10,800,000 |  |

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- Definition Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 28 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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