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Debt - Narrative (Details)
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 28, 2018
USD ($)
Apr. 27, 2018
USD ($)
entity
property
Mar. 31, 2018
Sep. 29, 2017
USD ($)
Oct. 22, 2015
USD ($)
entity
Jul. 20, 2015
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Sep. 30, 2018
USD ($)
property
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 22, 2016
USD ($)
Mar. 29, 2016
USD ($)
Aug. 11, 2015
USD ($)
Dec. 12, 2014
USD ($)
Debt Instrument [Line Items]                                  
Weighted average interest rate                 3.81%   3.13%            
Number of Wholly Owned Special Purpose Entities | entity   4     6                        
Number of Properties Owned by Special Purpose Entity | property   4                              
Long-term debt                 $ 481,573,000   $ 481,848,000 $ 456,472,000          
Repayments of Lines of Credit                 357,673,000 $ 0 0 55,000,000 $ 147,492,000        
Proceeds from Lines of Credit                 0 14,300,000 24,300,000 249,900,000 286,050,000        
Total principal                 490,055,000   484,728,000 460,428,000          
Revolving Credit Facility | Key Bank Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Line of Credit Facility, Current Borrowing Capacity $ 550,000,000                         $ 550,000,000   $ 410,000,000.0 $ 250,000,000.0
Initial debt instrument term 4 years                                
Credit facility borrowing capacity $ 1,250,000,000                               $ 1,250,000,000.00
Line Of Credit Facility, Extension Term 1 year                                
Line of Credit Facility, Remaining Borrowing Capacity                 $ 214,700,000   $ 143,100,000            
Debt Instrument, Covenant, Minimum Number of Pool Properties | property                 15                
Debt Instrument, Covenant, Maximum Aggregate Pool Value Contributed by Single Pool Property                 15.00%                
Debt Instrument, Covenant, Maximum Aggregate Pool Value to be Contributed byPool Properties Subject to ground Leases                 15.00%                
Debt Instrument, Covenant, Maximum Aggregate Pool Value to be Contributed by Pool Properties Under Development                 20.00%                
Debt Instrument, Covenant, Minimum Leasing Percentage of All Pool Properties                 90.00%                
Debt Instrument, Covenant, Asset Pool Leverage Ratio                 60.00%                
Debt Instrument, Covenant, Asset Pool Debt Service Coverage Ratio                 135.00%                
Repayments of Lines of Credit   $ 249,800,000                              
Number of Wholly Owned Special Purpose Entities Released From Obligation | entity   4                              
Revolving Credit Facility | Key Bank Term Loan [Member]                                  
Debt Instrument [Line Items]                                  
Line of Credit Facility, Current Borrowing Capacity $ 200,000,000                                
Initial debt instrument term 5 years                                
Term Loan [Member] | BofA / Key Bank Loan [Member]                                  
Debt Instrument [Line Items]                                  
Initial debt instrument term   10 years                              
Amount borrowed   $ 250,000,000                              
Contractual stated interest rate (percent)   4.32%                              
Period for written notice   30 days                              
Notes Payable, Other Payables [Member] | AIG Loan                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                     4.22%            
Initial debt instrument term         10 years           10 years            
Contractual stated interest rate (percent)         4.15%           4.15%            
Period for written notice         30 days                        
Long-term debt         $ 127,000,000                        
Debt Instrument, Payment Terms, Duration Requiring Monthly Payments of Interest Only         5 years           5 years            
Total principal                     $ 126,970,000 $ 126,970,000          
Line of Credit | Key Bank Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Weighted average interest rate                     2.92%            
Effective interest rate (percent)                 3.65%   3.32%            
Initial debt instrument term                 4 years   4 years 4 years          
Contractual stated interest rate (percent)                     2.87%            
Line Of Credit Facility, Extension Term                 1 year   1 year 1 year          
Total principal                 $ 85,000   $ 357,758,000 $ 333,458,000          
Mortgages                                  
Debt Instrument [Line Items]                                  
Total principal                 $ 376,970,000   126,970,000            
Mortgages | BofA / Key Bank Loan [Member]                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 4.36%                
Contractual stated interest rate (percent)                 4.32%                
Total principal                 $ 250,000,000   0            
Mortgages | AIG Loan                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 4.22%                
Contractual stated interest rate (percent)                 4.15%                
Total principal                 $ 126,970,000   $ 126,970,000            
LIBOR | Line of Credit | Key Bank Credit Facility [Member]                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Basis Spread on Variable Rate     1.50%           1.30%   1.50%            
Griffin Capital Essential Asset REIT, Inc. [Member]                                  
Debt Instrument [Line Items]                                  
Derivative notional amount                 $ 1,150,000,000                
Long-term debt                 1,354,350,000   $ 1,386,084,000 1,447,535,000          
Repayments of Lines of Credit                 106,253,000 294,054,000 41,493,000 35,954,000 31,407,000        
Proceeds from Lines of Credit                 96,100,000 $ 44,000,000 54,000,000 55,100,000 481,653,000        
Total principal                 $ 1,363,776,000   1,397,779,000 1,458,343,000          
Griffin Capital Essential Asset REIT, Inc. [Member] | Plainfield Mortgage Loan [Member]                                  
Debt Instrument [Line Items]                                  
Repayments of Debt             $ 18,700,000                    
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolver Loan, July 2015 [Member]                                  
Debt Instrument [Line Items]                                  
Repayments of Lines of Credit                     344,100,000            
Griffin Capital Essential Asset REIT, Inc. [Member] | Line of Credit | Unsecured Credit Facility (July 2015)                                  
Debt Instrument [Line Items]                                  
Credit facility borrowing capacity           $ 1,140,000,000.00                      
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility                                  
Debt Instrument [Line Items]                                  
Repayments of Lines of Credit                     $ 0 0 $ 173,000,000        
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility | Unsecured Credit Facility (July 2015)                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 3.89%   3.19%            
Initial debt instrument term           4 years                      
Debt instrument extended term           1 year                      
Credit facility borrowing capacity           $ 500,000,000                      
Maximum increment to borrowing capacity available under accordion feature           860,000,000                      
Minimum increments allowed under accordion feature           50,000,000.0                      
Maximum borrowing capacity available under accordion feature           $ 2,000,000,000.0                      
Total principal                 $ 715,000,000   $ 715,000,000 715,000,000          
Griffin Capital Essential Asset REIT, Inc. [Member] | Revolving Credit Facility | Revolver Loan                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 3.77%   3.79%            
Total principal                 $ 0   $ 10,153,000 397,409,000          
Griffin Capital Essential Asset REIT, Inc. [Member] | Fixed and Variable Rate Debt                                  
Debt Instrument [Line Items]                                  
Weighted average interest rate                 3.70%   3.53%            
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages                                  
Debt Instrument [Line Items]                                  
Total principal                 $ 648,776,000   $ 672,626,000 345,934,000          
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | TW Telecom Loan [Member]                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 0.00%   4.04%            
Total principal                 $ 0   $ 19,169,000 20,353,000          
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Bank of America loan                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 3.91%   3.90%            
Initial debt instrument term       10 years         10 years                
Amount borrowed       $ 375,000,000.0                          
Contractual stated interest rate (percent)       3.77%         3.77%   3.77%            
Debt Instrument, Prepayment Condition, Prior Notice Required       30 days                          
Payments of Debt Issuance Costs       $ 3,000,000                          
Total principal                 $ 375,000,000   $ 375,000,000 0          
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | AIG Loan                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 5.07%   5.07%            
Contractual stated interest rate (percent)                 4.96%   4.96%            
Total principal                 $ 107,998,000   $ 109,275,000 110,640,000          
Griffin Capital Essential Asset REIT, Inc. [Member] | Mortgages | Plainfield Mortgage Loan [Member]                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                     0.00%            
Contractual stated interest rate (percent)                     0.00%            
Total principal                     $ 0 $ 18,932,000          
Griffin Capital Essential Asset REIT, Inc. [Member] | Unsecured Debt                                  
Debt Instrument [Line Items]                                  
Proceeds from Lines of Credit             $ 21,000,000.0 $ 23,000,000.0                  
Griffin Capital Essential Asset REIT, Inc. [Member] | Unsecured Debt | Unsecured Credit Facility (July 2015)                                  
Debt Instrument [Line Items]                                  
Initial debt instrument term           5 years                      
Credit facility borrowing capacity           $ 640,000,000.0                      
Repayments of Debt       $ 344,100,000                          
Griffin Capital Essential Asset REIT, Inc. [Member] | Unsecured Debt | Increase Agreement                                  
Debt Instrument [Line Items]                                  
Credit facility borrowing capacity                             $ 715,000,000.0    
Griffin Capital Essential Asset REIT, Inc. [Member] | Fixed Rate Debt                                  
Debt Instrument [Line Items]                                  
Weighted average interest rate                 3.75%   3.54%            
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR                                  
Debt Instrument [Line Items]                                  
Effective interest rate (percent)                 2.11%   1.56%            
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR | Revolving Credit Facility | Unsecured Credit Facility (July 2015)                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Basis Spread on Variable Rate                     1.40%            
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR | Revolving Credit Facility | Revolver Loan                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Basis Spread on Variable Rate                     1.45%            
Griffin Capital Essential Asset REIT, Inc. [Member] | LIBOR | Mortgages | TW Telecom Loan [Member]                                  
Debt Instrument [Line Items]                                  
Debt Instrument, Basis Spread on Variable Rate                     2.45%            
Griffin Capital Essential Asset REIT, Inc. [Member] | Interest Rate Swap                                  
Debt Instrument [Line Items]                                  
Derivative notional amount                 $ 425,000,000   $ 725,000,000.0