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Related Party Transactions - Narrative (Details)
 1 Months Ended 9 Months Ended 12 Months Ended
Jul. 21, 2016
shares
Jul. 01, 2016
USD ($)
ft²
Jan. 13, 2016
nominee
director
director_nominee
Dec. 16, 2015
ft²
Apr. 01, 2015
USD ($)
ft²
project
director
property
director_nominee
shares
May 31, 2016
shares
Sep. 30, 2016
ft²
building
Sep. 30, 2015
ft²
building
Dec. 31, 2015
ft²
project
property
Mar. 31, 2016
director
Dec. 15, 2015
ft²
Related Party Transaction [Line Items]                      
Area of real estate property (in square feet) | ft²             820,587 483,862      
Number of real estate properties acquired | building             6 2      
Directors on the board | director     10   11         8  
Director nominees on the board | director_nominee         3            
Number of director nominees who resigned | director     1                
Number of nominees able to be designated | nominee     3                
Equity consideration, lower threshold for three nominee designations     50.00%                
Number of director nominees designated, sponsor stockholders, equity consideration, 30% to 50% | director_nominee     2                
Number of director nominees designated, sponsor stockholders, equity consideration, 15% to 30% | director_nominee     1                
Equity consideration, lower threshold for nominee designations     15.00%                
Minimum number of nominees held to increase number of directors on the board | nominee     1                
Maximum directors on the board | director     12                
Number of nominees permitted to be appointed to committees, given sponsor stockholders' right to designate two director nominees | director_nominee         1            
Upper threshold of equity interests for sponsor stockholders' restrictions         10.00%            
Aggregate maximum common stock issuable without written consent         16,843,028            
Upper threshold of sponsor stockholders' equity consideration to maintain proxy voting         15.00%            
Holding period for redemption of units and grants         14 months            
Number of shares used in exchange valuation         1            
Holding period prior to transfers of common units         14 months            
Adjusted maximum aggregate common interests for sponsor stockholders         17,707,056            
Maximum tenant ownership allowable for sponsor stockholders to reach excepted holder limit, overall company excluding Market street         9.90%            
Maximum tenant ownership allowable for sponsor stockholders to reach excepted holder limit, Market street         5.45%            
Maximum tenant ownership allowable for sponsor stockholders to reach excepted holder limit, minimum ownership percentage after exclusions         2.00%            
Maximum rental income expected to be produced by tenants allowable for sponsor stockholders to reach excepted holder limit, overall company excluding Market street         0.50%            
Maximum rental income expected to be produced by tenants allowable for sponsor stockholders to reach excepted holder limit, Market street         0.50%            
Minimum period between qualified offerings         120 days            
Qualified offerings, minimum amount | $         $ 50,000,000            
Upper threshold for sponsor stockholders' equity consideration at which company cannot consummate significant transactions         9.80%            
Maximum aggregate value of units for redemption | $         $ 50,000,000            
Common Units                      
Related Party Transaction [Line Items]                      
Number of shares redeemed during the period (in shares) 19,000,000         10,000,000          
EOP Northern California Portfolio                      
Related Party Transaction [Line Items]                      
Area of real estate property (in square feet) | ft²         8,200,000       8,200,000    
Gross payments to acquire business | $         $ 1,750,000,000            
Consideration transferred, common units (in shares)         63,474,791            
EOP Northern California Portfolio | Common Units                      
Related Party Transaction [Line Items]                      
Consideration transferred, common units (in shares)         8,626,311            
EOP Northern California Portfolio | Office Building                      
Related Party Transaction [Line Items]                      
Number of real estate properties acquired | property         26       26    
EOP Northern California Portfolio | Development Parcel                      
Related Party Transaction [Line Items]                      
Number of development projects acquired | project         2       2    
11601 Wilshire Boulevard Office Building                      
Related Party Transaction [Line Items]                      
Area of real estate property (in square feet) | ft²   500,475                  
Operating leases, term of contract   8 years                  
Total consideration | $   $ 311,000,000                  
Area of leased property (in square feet) | ft²   6,638                  
Annual rent cost per year | $   $ 279,000                  
Blackstone Real Estate Partners                      
Related Party Transaction [Line Items]                      
Area of real estate property (in square feet) | ft²       42,371             40,120
Operating leases, renewal term       3 years              
Operating leases, term of contract       10 years