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Investments - Balance of Investments (Details) - Griffin Capital Essential Asset REIT, Inc. [Member] - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]                
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest           $ 500,000    
Investments [Roll Forward]                
Balance as of December 31, 2017       $ 37,114,000 $ 46,313,000 46,313,000    
Initial contribution       3,266,000 0 0 $ 18,129,000 $ 0
Net loss   $ (579,000) $ (517,000) (1,617,000) (1,511,000) (2,065,000) (1,640,000) (1,475,000)
Distributions       (5,627,000)        
Other comprehensive income   (12,000) $ 311,000 224,000 489,000 465,000 241,000 $ (189,000)
Balance as of September 30, 2018   33,360,000   33,360,000   37,114,000 46,313,000  
Digital Realty Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest           465,000    
Investments [Roll Forward]                
Balance as of December 31, 2017       37,114,000 $ 46,313,000 46,313,000    
Initial contribution       0        
Net loss       (1,617,000)   (2,065,000)    
Distributions       (5,627,000)   (7,599,000)    
Other comprehensive income       224,000        
Balance as of September 30, 2018   30,094,000   30,094,000   37,114,000 $ 46,313,000  
Heritage Common X                
Investments [Roll Forward]                
Balance as of December 31, 2017       0        
Initial contribution $ 3,100,000     3,266,000        
Net loss       0        
Distributions       0        
Other comprehensive income       0        
Balance as of September 30, 2018   $ 3,266,000   $ 3,266,000   $ 0