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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

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- 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 + Details
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- 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 + Details
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