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Related Party Arrangements - Reimbursements to Advisor (Narrative) (Details) - Advisor
3 Months Ended
Mar. 31, 2018
USD ($)
quarter
Operating Costs  
Related Party Transaction [Line Items]  
Reimbursement of personnel costs related to executive officers and other personnel involved in activities for which the Advisor receives an acquisition fee or disposition fee $ 0
Number of preceding fiscal quarters | quarter 4
Reimbursement expense period 12 months
Operating Costs | Maximum  
Related Party Transaction [Line Items]  
Percentage of average invested assets reimbursable as operating costs 2.00%
Percentage of net income, without reduction for any additions to reserves for depreciation, loan losses or other similar non-cash reserves and excluding any gain from the sale of the company's assets 25.00%
Organization and Offering Costs  
Related Party Transaction [Line Items]  
Gross proceeds from primary offering $ 1,700,000,000
Reimbursable organization and offering costs, excluding selling commissions and dealer manager fee, as a percentage of total proceeds 1.00%
Organization and Offering Costs | Maximum  
Related Party Transaction [Line Items]  
Percentage of gross offering proceeds from primary offering, reimbursable as organization and offering costs 15.00%
Expected reimbursable organization and offering costs, excluding selling commissions and dealer manager fee $ 22,500,000.0
Expected reimbursable organization and offering costs, excluding selling commissions and dealer manager fee, as a percentage of total proceeds 1.50%