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Income Taxes - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) Assets | Dec. 31, 2014 USD ($) | Dec. 31, 2013 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 |  |
U.S. federal excise taxes | $ 0 |  |
Number of subsequent taxable years | 4 years |  |
Tax cost basis of assets | $ 10,600,000,000 | $ 10,600,000,000 | $ 10,400,000,000
Net payment | 1,500,000 | 1,600,000 | 1,900,000
Tax expense | 6,286,000 | 1,855,000 | $ 2,685,000
Net deferred tax assets | 65,400,000 | $ 84,500,000 |
Net operating loss carryforwards | $ 38,000,000 |  |
Expiry of net operating loss carryforwards | 2022 through 2035 |  |
Puerto Rico Tax Restructuring [Member] |  |  |
Income Taxes [Line Items] |  |  |
Number of properties | Assets | 14 |  |
Prepay of taxes | $ 20,200,000 |  |
Taxable REIT subsidiary activity | 16,800,000 |  |
Tax expense | $ 3,400,000 |  |
Effective tax rate spread | 2.00% |  |
Effective tax rate | 12.00% |  |
Withholding tax rate | 10.00% |  |
Effective tax rate on capital gains | 12.00% | 29.00% |

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