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Revenues (Details)
 3 Months Ended
Jan. 01, 2018
USD ($)
affiliate
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Dividends in excess of cumulative earnings   $ (810,740,000) $ (836,269,000)
Number of unconsolidated affiliates included in partial sale of real estate assets | affiliate 1    
Tenant reimbursements period related to certain capital expenditure minimum, in years   5 years  
Tenant reimbursements period related to certain capital expenditure maximum, in years   15 years  
Revenue, performance obligation, lease commission recognized upon lease execution, percentage   50.00%  
Revenue, remaining performance obligation   $ 0  
Accounting Standards Update 2017-05, Joint Venture Impact      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
New accounting pronouncement or change in accounting principle, effect of change on operating results $ 901,000    
Accounting Standards Update 2017-05, Unconsolidated Affiliate Impact      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
New accounting pronouncement or change in accounting principle, effect of change on operating results 57,850,000    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Dividends in excess of cumulative earnings $ 196,000