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Debt - Bank Line of Credit and Term Loans (Details)
$ in Thousands, £ in Millions
1 Months Ended 3 Months Ended
Jan. 12, 2012
Apr. 30, 2017
GBP (£)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
GBP (£)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 12, 2015
GBP (£)
Jun. 30, 2012
GBP (£)
Debt Instrument                
Debt instrument, variable rate basis     30.0          
Net repayment under bank line of credit     $ 375,812          
Bank line of credit         $ 492,421 $ 899,718    
Debt         8,050,189      
Senior unsecured notes         $ 7,136,336 $ 7,133,538    
Line of Credit and Term Loan                
Debt Instrument                
Debt instrument, covenant debt to assets (as a percent)       60.00% 60.00%      
Debt instrument, covenant secured debt to assets (as a percent)       30.00% 30.00%      
Debt instrument, covenant unsecured debt to unencumbered assets (as a percent)       60.00% 60.00%      
Debt instrument, covenant minimum fixed charge coverage ratio       1.5 1.5      
Debt instrument, covenant net worth         $ 6,500,000      
Bank Line of Credit                
Debt Instrument                
Line of credit facility, maximum borrowing capacity         2,000,000      
Debt instrument, variable rate basis     LIBOR          
Length of debt instrument extension period     1 year          
Debt instrument, basis spread on variable rate (as a percent)     1.05%          
Debt instrument, facility fee (as a percent)     0.20%          
Line of credit facility additional aggregate amount, maximum     $ 500,000          
Net repayment under bank line of credit   £ 105.0 $ 440,000          
Line of Credit Portion Denominated in Foreign Currency       £ 394.0 $ 492,000      
Weighted-average interest rate (as a percent)       1.65% 1.65%      
Debt         $ 492,421      
2012 Term Loan                
Debt Instrument                
Debt | £               £ 137.0
2015 Term Loan                
Debt Instrument                
Length of debt instrument extension period 1 year              
Debt instrument, basis spread on variable rate (as a percent) 1.15%              
Derivative, fixed interest rate (as a percent)       1.966% 1.966%      
Term of the interest rate swap agreement 3 years              
Maturity period of debt instruments 4 years              
Senior unsecured notes         $ 275,000   £ 220.0