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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 |
--- | --- | --- | --- | ---
Jun. 02, 2015 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Advisor | Amended Advisory Agreement |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Minimum monthly base management fee | $ 18,000,000.0 |  |  |  |  |
Advisor | Variable Base Management Fee |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | $ 2,300,000 | $ 800,000 | $ 6,600,000 | $ 3,400,000 |
Incurred |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 8,220,000 | 6,956,000 | 24,425,000 | 20,925,000 |
Forgiven |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 0 | 0 | 0 | 0 |
Payable |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party payable |  | 0 |  | 0 |  | $ 49,000
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 | Payable |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party payable |  | 0 |  | 0 |  | 49,000
Recurring Fees | Asset management fees | Incurred |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 6,758,000 | 5,312,000 | 20,123,000 | 16,852,000 |
Recurring Fees | Asset management fees | Forgiven |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 0 | 0 | 0 | 0 |
Recurring Fees | Asset management fees | Payable |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party payable |  | 0 |  | 0 |  | 0
Recurring Fees | Property management fees | Incurred |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 1,462,000 | 1,283,000 | 4,302,000 | 3,712,000 |
Recurring Fees | Property management fees | Forgiven |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 0 | 0 | 0 | 0 |
Recurring Fees | Property management fees | Payable |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party payable |  | 0 |  | 0 |  | 0
Recurring Fees | Incentive compensation | Incurred |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 0 | 361,000 | 0 | 361,000 |
Recurring Fees | Incentive compensation | Forgiven |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  | 0 | $ 0 | 0 | 0 |
Recurring Fees | Incentive compensation | Payable |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party payable |  | $ 0 |  | 0 |  | $ 0
General and Administrative Expense | Incurred |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses |  |  |  | $ 800,000 | $ 800,000 |

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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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