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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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 |  |
Number of subsequent taxable years |  | 4 years |  |
Tax cost basis of assets | $ 8,600,000,000 | $ 8,700,000,000 | $ 8,500,000,000 | $ 8,600,000,000
Net refund recorded |  |  | 500,000 | 2,100,000
Net payment |  | 1,100,000 |  |
Net deferred tax assets |  | 81,500,000 | 57,600,000 |
Net operating loss carryforwards |  | 36,700,000 |  |
Expiry of net operating loss carryforwards |  | 2017 through 2032 |  |
Tax restructuring of investments |  | 10,900,000 |  |
Puerto Rico loss carryforwards |  | 30,000,000 |  |
Impairment charge | 19,300,000 |  |  | 19,300,000
Lease liability charge | $ 3,000,000 |  |  | $ 3,000,000
Term of cumulative pre-tax book loss |  |  |  | 3 years
Puerto Rico [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Term of cumulative pre-tax book loss |  | 3 years |  |

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