Related Party Transactions - Narrative (Details) $ in Thousands, ft² in Millions			3 Months Ended
	Feb. 16, 2018 USD ($)	Sep. 20, 2017 USD ($) shares	Mar. 31, 2018 USD ($) ft² shares	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²			7.3
Total transaction price			$ 1,178,951		$ 1,178,866
Percent of organizational and offering costs limit (percent)			15.00%
Incurred			$ 5,966	$ 7,477
Underwriting compensation, percent of gross proceeds			9.00%
Outstanding shares owned by affiliates (shares) | shares			547,567
Class T
Related Party Transaction [Line Items]
Daily accrual rate for shares sold (percent)			0.00274%
Class S
Related Party Transaction [Line Items]
Daily accrual rate for shares sold (percent)			0.00274%
Class D
Related Party Transaction [Line Items]
Daily accrual rate for shares sold (percent)			0.00068%
The Advisor
Related Party Transaction [Line Items]
Shares sold to Advisor (shares) | shares		263,992
Shares sold to Advisor		$ 2,500
Organizational and offering costs advanced by the Advisor
Related Party Transaction [Line Items]
Incurred			$ 240	0
Advisory Agreement | Class T
Related Party Transaction [Line Items]
Daily accrual rate for shares sold (percent)			0.00342%
Performance distribution allocation
Related Party Transaction [Line Items]
Performance Distribution, Hurdle Rate, Annualized Rate Of Return On Net Asset Value			5.50%
Related Party Transaction, Amounts of Transaction	$ 1,200
Performance Distribution, Percentage Of Total Return			12.50%
Incurred			$ 2,061	0
Dealer Manager Agreement
Related Party Transaction [Line Items]
Underwriting compensation, percent of gross proceeds			10.00%
Dealer Manager Agreement | Class T
Related Party Transaction [Line Items]
Daily accrual rate for shares sold (percent)			0.00274%
Dealer Manager Agreement | Class AA
Related Party Transaction [Line Items]
Organizational and offering costs advanced by and due to the Advisor (percent)			4.00%
Dealer Distribution Fee
Related Party Transaction [Line Items]
Underwriting compensation, percent of gross proceeds			9.00%
Dealer Distribution Fee | Class T
Related Party Transaction [Line Items]
Daily accrual rate for shares sold (percent)			0.00068%
Advisor Distribution Fee | Class T
Related Party Transaction [Line Items]
Daily accrual rate for shares sold (percent)			0.00205%
Reimbursement, Services Provided That Are not Entitled to Advisor Fees | The Advisor
Related Party Transaction [Line Items]
Incurred			$ 150	170
Reimbursement, Reimbursible Expenses
Related Party Transaction [Line Items]
Average invested assets for preceding 12 months (percent)			2.00%
Percentage of Company's net income before addition of reserves (percent)			25.00%
Reimbursement, Reimbursible Expenses | The Advisor
Related Party Transaction [Line Items]
Incurred			$ 10	$ 30
Acquisition fees and expenses
Related Party Transaction [Line Items]
Area of real estate property (in sqft) | ft²			1.0
Total transaction price			$ 80,000
Limited Partnership Units [Member] | Performance distribution allocation
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 1,200