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Nature of Business and Financial Statement Presentation - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) Assets | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($)
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |
Tax expense | $ 573,000 |  | $ 642,000 | $ 5,473,000 | $ 1,327,000
Impact on net income due to adoption of new accounting pronouncement | $ 0 |  |  | $ 0 |
Puerto Rico Tax Restructuring [Member] |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |
Number of assets owned | Assets |  | 14 |  |  |
Prepay of taxes |  | $ 20,200,000 |  |  |
Effective tax rate |  | 10.00% |  |  |
Taxable REIT subsidiary activity |  | $ 16,800,000 |  |  |
Tax expense |  | $ 3,400,000 |  |  |
Effective tax rate spread |  | 2.00% |  |  |
Old Tax Rate [Member] | Puerto Rico Tax Restructuring [Member] |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |
Effective tax rate on capital gains |  | 29.00% |  |  |
Effective tax rate |  | 39.00% |  |  |
New Tax Rate [Member] | Puerto Rico Tax Restructuring [Member] |  |  |  |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |  |  |  |
Effective tax rate on capital gains |  | 12.00% |  |  |
Effective tax rate |  | 10.00% |  |  |

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