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Related Party Transactions - Schedule of Amount Contractually Due and Forgiven in Connection With Operation Related Services (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Transfer Asset and Personnel Services
Related Party Transaction [Line Items]
Related party expenses					$ 300,000
Advisor | Variable Base Management Fee
Related Party Transaction [Line Items]
Related party expenses	$ 1,300,000	$ 800,000	$ 3,700,000	$ 2,100,000
Affiliated Entity | Transfer Asset and Personnel Services
Related Party Transaction [Line Items]
Related party expenses					100,000
Advisor and Dealer Manager | Transfer Asset and Personnel Services
Related Party Transaction [Line Items]
Related party expenses					100,000
Incurred
Related Party Transaction [Line Items]
Related party expenses	6,956,000	6,368,000	20,925,000	18,988,000
Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	1,177,000
(Receivable) Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	49,000		49,000		348,000
Nonrecurring Fees | Fees on gain from sale of investments | Incurred
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Fees on gain from sale of investments | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Nonrecurring Fees | Fees on gain from sale of investments | (Receivable) Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	49,000		49,000		49,000
Recurring Fees | Asset management fees | Incurred
Related Party Transaction [Line Items]
Related party expenses	5,312,000	5,250,000	16,852,000	15,647,000
Recurring Fees | Asset management fees | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	0
Recurring Fees | Asset management fees | (Receivable) Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	0		0		240,000
Recurring Fees | Property management fees | Incurred
Related Party Transaction [Line Items]
Related party expenses	1,283,000	1,118,000	3,712,000	3,341,000
Recurring Fees | Property management fees | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	0	0	1,177,000
Recurring Fees | Property management fees | (Receivable) Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	0		0		59,000
Recurring Fees | Property management fees | (Receivable) Payable | Prepaid Expenses and Other Current Assets
Related Party Transaction [Line Items]
Related party (receivable) payable	0		0		200,000
Recurring Fees | Incentive compensation | Incurred
Related Party Transaction [Line Items]
Related party expenses	361,000	0	361,000	0
Recurring Fees | Incentive compensation | Forgiven
Related Party Transaction [Line Items]
Related party expenses	0	$ 0	0	$ 0
Recurring Fees | Incentive compensation | (Receivable) Payable
Related Party Transaction [Line Items]
Related party (receivable) payable	$ 0		$ 0		$ 0

X

- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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