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Goodwill, Deferred Leasing Costs and Other Intangibles - Goodwill (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Goodwill [Roll Forward]      
Goodwill $ 1,534,561,000 $ 680,127,000 $ 678,267,000
Business combinations 0 1,440,229,000 1,860,000
Transfer to held for sale 0 (20,000,000) 0
Disposition 0 (249,795,000) 0
Impairment 0 (316,000,000) 0
Goodwill 1,534,561,000 1,534,561,000 680,127,000
Industrial      
Goodwill [Roll Forward]      
Goodwill 20,000,000    
Impairment 0 0  
Goodwill 20,000,000 20,000,000  
Investment management      
Goodwill [Roll Forward]      
Goodwill 1,514,561,000    
Impairment 0 0 $ 0
Goodwill $ 1,514,561,000 $ 1,514,561,000  
Minimum      
Goodwill [Roll Forward]      
Terminal year residual multiples   6.5  
Incentive fee multiples   3  
Discount rate percentage   9.00%  
Maximum      
Goodwill [Roll Forward]      
Terminal year residual multiples   20  
Incentive fee multiples   5  
Discount rate percentage   25.00%