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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 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 (1,367,000) 134,447,000
Percentage of tax position benefit maximum than being realized upon ultimate settlement 50.00%  
Liabilities for uncertain tax positions $ 0