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Income Taxes - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Assets | Dec. 31, 2014 USD ($)
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 | $ 9,800,000,000 | 10,600,000,000 |
Net payment | 1,000,000 | 1,500,000 | 1,600,000
Tax expense | 1,781,000 | $ 6,286,000 | $ 1,855,000
Puerto Rico [Member] |  |  |
Income Taxes [Line Items] |  |  |
Number of properties | Assets |  | 14 |
Prepay of taxes |  | $ 20,200,000 |
Prepaid expenses | $ 16,200,000 | 16,800,000 |
Tax expense |  | $ 3,400,000 |
Effective tax rate spread |  | 2.00% |
Effective tax rate |  | 12.00% | 0.00%
Withholding tax rate |  | 10.00% |
Effective tax rate on capital gains |  | 12.00% | 29.00%

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