Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 10, 2018
Class of Stock [Line Items]
Entity Registrant Name	Griffin Capital Essential Asset REIT II, Inc.
Entity Central Index Key	0001600626
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Class T
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		52,412
Class S
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		272
Class D
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		9,087
Class I
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		285,121
Class A
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		25,980,630
Class AA
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		49,987,408
Class AAA
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		972,384