Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 13, 2019
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, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Extended Transition Period	true
Class T
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		228,505
Class S
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		282
Class D
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		19,431
Class I
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		820,852
Class A
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		25,901,509
Class AA
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		50,103,375
Class AAA
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		980,981
Common Class E
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding (in shares)		175,334,674