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Income Taxes - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2014
Jun. 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 (2,052,000) 3,377,000   (3,419,000) 137,824,000
Percentage of tax position benefit maximum than being realized upon ultimate settlement       50.00%  
Liabilities for uncertain tax positions $ 0     $ 0