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Revenue Recognition - Managed Equity REITs (Details) - Managed REITs - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Business Management and Incentive Fees    
Business management fees as a percentage of transferred real estate assets 0.50%  
Business management fees as a percentage of average invested capital below the threshold limit 0.70%  
Maximum threshold amount for calculating the business management fees $ 250,000  
Business management fees as a percentage of average invested capital above the threshold limit 0.50%  
Minimum threshold amount for calculating the business management fees $ 250,000  
Business management fees as a percent of average market capitalization below the threshold limit 0.70%  
Business management fees as a percent of average market capitalization above the threshold limit 0.50%  
Contingent incentive business management fee percentage 12.00%  
Measurement period for calculating the annual incentive fee 3 years 3 years
Aggregate base business management fees $ 30,602 $ 27,760
Aggregate incentive business management fees $ 155,881 $ 52,407