Merger Transaction - Narrative (Details)	Dec. 22, 2016 USD ($) installment $ / shares shares	Dec. 16, 2016 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 $ / shares	Dec. 21, 2016 $ / shares
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)			$ 0.01	$ 0.01
The Letter Agreement
Business Acquisition [Line Items]
Reimbursement from related party | $	$ 5,100,000	$ 6,300,000	$ 0
Percent over gross offering proceeds to trigger Advisor reimbursement		2.00%
Period of installments		8 months
Multiple for valuing Class B Units		2.27
Period for valuing Class B Units		30 days
Number of equal cash installments (installment) | installment	8
Class B Units | The Letter Agreement
Business Acquisition [Line Items]
Number of shares as reimbursement (in shares) | shares		66,344
Merger Agreement
Business Acquisition [Line Items]
Equity consideration (in shares) | shares	9,600,000
Value of consideration | $	$ 220,868,000
Merger Agreement | Common Stock
Business Acquisition [Line Items]
Common stock conversion ratio	2.27
Share price (in dollars per share)					$ 23.10
Merger Agreement | Common Stock | Class B Units
Business Acquisition [Line Items]
Common stock conversion ratio	2.27
Merger Agreement | American Realty Capital Global Trust II, Inc.
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)	$ 0.01