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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Income Taxes [Line Items] |  |  |  |  |
Minimum Distribution Percentage of Taxable Income to Qualify for Real Estate Investment Trust |  |  |  | 90.00% |
Minimum distribution Percentage of Taxable Income to avoid Federal Income Taxes |  |  |  | 100.00% |
Expected net tax benefit |  |  | $ 137,700,000 |  |
Income tax (expense) benefit | (2,071,000) | (4,571,000) |  | (5,490,000) | 133,253,000
Percentage of tax position benefit maximum than being realized upon ultimate settlement |  |  |  | 50.00% |
Liabilities for uncertain tax positions | $ 0 |  |  | $ 0 |

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