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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
 3 Months Ended 12 Months Ended 17 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Jun. 05, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Incentive fee allocable to ABP Trust       $ 26,611,000 $ 0    
Percent of gross collected rents       3.00%      
Percent of construction supervision       $ 0.05      
Property management fees revenue       33,615,000 29,685,000 $ 51,233,000  
Reimbursable payroll and related costs       37,660,000 28,230,000 64,049,000  
Equity based compensation expense and related reimbursements       7,997,000 5,931,000 11,444,000  
Advisory fees       2,620,000 2,380,000 2,244,000  
Management services revenue       $ 226,660,000 $ 162,326,000 218,753,000  
RIF              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Advisory fee percentage based on daily managed assets       0.85%      
Managed REITs              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Percentage of historical cost of transferred real estate assets   0.50%   0.50%      
Percentage of average invested capital below threshold limit   0.70%   0.70%      
Threshold amount, maximum   $ 250,000,000   $ 250,000,000      
Percentage of average invested capital above threshold limit   0.50%   0.50%      
Threshold limit, minimum   $ 250,000,000   $ 250,000,000      
Percentage of management fees paid in cash   100.00%         90.00%
Percentage of average market capitalization below threshold limit       0.70%      
Percentage of average market capitalization above threshold limit       0.50%      
Remaining term after termination (in years)       10 years      
Percentage of fees paid with common shares             10.00%
Incentive management fee percentage   15.00%         12.00%
Measurement period for annual incentive fee (in years)       2 years      
Measurement period for annual incentive fee, thereafter (in years)         3 years    
Aggregate annual base business management fees       $ 104,824,000 $ 108,035,000 126,525,000  
Value of shares received from related party       0 6,564,000 8,146,000  
Aggregate incentive business management fees $ 62,263,000     $ 62,263,000 0 3,663,000  
EQC              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Value of shares received from related party         0 2,354,000  
Proceeds from management fees           15,349,000  
Managed Operators, ABP Trust and AIC              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Management fee percentage pursuant to agreement       0.60%      
Aggregate annual business management fees       $ 25,846,000 24,606,000 21,983,000  
AIC              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Percent of total premiums paid       3.00%      
Management services revenue       $ 240,000 247,000 337,000  
RMR Advisors and Tremont Advisors              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Advisory fees       2,370,000 $ 2,380,000 $ 2,244,000  
Tremont Advisors              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Advisory fees       250,000      
Management services revenue       $ 54,000      
Up C Transaction | ABP Trust              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Incentive fee allocable to ABP Trust     $ 26,611,000        
RMR LLC | Up C Transaction              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Duration of written notice for convenience (in days)       60 days      
Duration of written notice for performance (in days)       60 days      
Window after calendar year end for written notice (in days)       60 days      
Duration of written notice after change of control (in months)       12 months      
Tremont Advisors              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Advisory fee percentage based on weighted average outstanding balance of strategic investments       1.35%      
Advisory fee percentage based on outstanding principal balance of outstanding loans       0.50%      
Minimum | Tremont Advisors              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Advisory fee percentage based on aggregate principal amounts of loan originated       0.50%      
Maximum | Tremont Advisors              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Advisory fee percentage based on aggregate principal amounts of loan originated       0.75%