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Equity Equity - Distributions (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Distributions, Ordinary Income $ 0.04 $ 0.31 $ 0.21
Distributions, Ordinary Income, Percent 7.90% 57.10% 38.60%
Distributions, Return of Capital $ 0.51 $ 0.24 $ 0.34
Distributions, Return of Capital, Percent 92.10% 42.90% 61.40%
Distributions, Total $ 0.55 $ 0.55 $ 0.55
Distributions, Total, Percent 100.00% 100.00% 100.00%
Griffin Capital Essential Asset REIT, Inc. [Member]      
Class of Stock [Line Items]      
Distributions, Ordinary Income $ 0.40 $ 0.47 $ 0.48
Distributions, Ordinary Income, Percent 59.00% 69.00% 69.00%
Distributions, Capital Gain $ 0.18 $ 0.00 $ 0.00
Distributions, Capital Gain, Percent 26.00% 0.00% 0.00%
Distributions, Return of Capital $ 0.10 $ 0.21 $ 0.21
Distributions, Return of Capital, Percent 15.00% 31.00% 31.00%
Distributions, Total $ 0.68 $ 0.68 $ 0.69
Distributions, Total, Percent 100.00% 100.00% 100.00%