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Real Estate - Aggregate Purchase Price (Details)
 9 Months Ended 12 Months Ended
Jul. 31, 2017
USD ($)
Nov. 02, 2015
Sep. 30, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Real Estate [Line Items]            
Related Party Acquisition Fee for Purchase of Property, Base Rate       2.00%    
Acquisitions       $ 45,016,000 $ 615,972,000 $ 516,965,000
Approx. Square Feet | ft²     7,300,000 7,300,000    
Related Party Acquisition, Percentage of Acquisition Value       1.00%    
Related Party Acquisition Fee for Purchase of Property   3.85%        
Related Party Acquisition Fee for Purchase of Property, Contingent Rate   1.85%        
Acquisition Fee, Amount Retained Subject to Conditions       $ 5,000,000    
Griffin Capital Essential Asset REIT, Inc. [Member]            
Real Estate [Line Items]            
Acquisitions       $ 133,747,000 $ 42,438,000 $ 1,087,153,000
Acquisition Fees and Expenses     $ 5,700,000      
Percentage of acquisition fees (percent)     2.50% 2.50%    
Percent reimbursed (percent)     0.50% 0.50%    
Griffin Capital Essential Asset REIT, Inc. [Member] | HealthSpring [Member]            
Real Estate [Line Items]            
Purchase Price       $ 130,000,000    
Approx. Square Feet | ft²       451,600    
Acquisition Fees and Expenses       $ 3,791,000    
Percentage of acquisition fees (percent)       2.50%    
Percent reimbursed (percent)       0.50%    
Griffin Capital Essential Asset REIT, Inc. [Member] | Quaker Property [Member]            
Real Estate [Line Items]            
Purchase Price     $ 59,600,000      
Approx. Square Feet | ft²     605,400      
Acquisition Fees and Expenses     $ 1,777,000      
Percentage of acquisition fees (percent)     2.50%      
Percent reimbursed (percent)     0.50%      
Griffin Capital Essential Asset REIT, Inc. [Member] | McKesson Property [Member]            
Real Estate [Line Items]            
Purchase Price     $ 67,000,000      
Approx. Square Feet | ft²     271,100      
Acquisition Fees and Expenses     $ 2,139,000      
Griffin Capital Essential Asset REIT, Inc. [Member] | Shaw Property [Member]            
Real Estate [Line Items]            
Purchase Price     $ 56,526,000      
Approx. Square Feet | ft²     1,001,500      
Acquisition Fees and Expenses     $ 1,782,000      
The Allstate Property [Member]            
Real Estate [Line Items]            
Acquisitions       $ 14,750,000    
Approx. Square Feet | ft²       70,300    
Acquisition Fees and Expenses       $ 1,200,000    
Acquisition Related Costs to Affiliates       402,000    
Line of Credit Draw       273,000    
Business Combination, Consideration Transferred       14,800,000    
MISO Property [Member]            
Real Estate [Line Items]            
Acquisitions       $ 28,600,000    
Approx. Square Feet | ft²       133,400    
Acquisition Related Costs to Affiliates       $ 696,000    
Line of Credit Draw       $ 529,000    
Contingent Advisor Payment Holdback - Organization and Offering Expenses and Dealer Manager Fees [Member]            
Real Estate [Line Items]            
Payments of Contingent Advisor Payment Holdback $ 5,000,000.0