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Property, net - Quantitative information on level 3 real estate (Details)
9 Months Ended
Sep. 30, 2016
Minimum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Market rents per square foot 5.75
Minimum | Significant Unobservable Inputs (Level 3)  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Terminal capitalization rate 7.00%
Discount rate 8.00%
Maximum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Market rents per square foot 20.00
Maximum | Significant Unobservable Inputs (Level 3)  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Terminal capitalization rate 8.00%
Discount rate 9.50%