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Summary of Significant Accounting Policies (Details) (USD $)
In Billions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Carrying Value, Fair Value Disclosure [Member]
Dec. 31, 2013
Carrying Value, Fair Value Disclosure [Member]
Jun. 30, 2014
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2013
Estimate of Fair Value, Fair Value Disclosure [Member]
Revenue Recognition [Abstract]          
Term of residency agreements- minimum 30 days        
Term of residency agreements - maximum 1 year        
Fair Value of Financial Instruments [Line Items]          
Long-term Debt, Fair Value   $ 2.6 $ 2.6 $ 2.6 $ 2.6