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Long-Term Debt - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 05, 2021 | Jun. 30, 2026 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Jun. 05, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Ratio of indebtedness to net capital |  |  | 702.00% |  |  |
DSCR less than 1.75x - Cash Flow Sweeping Event |  |  | 175.00% |  |  |
DSCR less than 1.20x - Rapid Amortization Event |  |  | 120.00% |  |  |
Interest-only DSCR less than 1.20x - Manager Termination Event |  |  | 120.00% |  |  |
Interest-only DSCR less than 1.10x - Default Event |  |  | 110.00% |  |  |
Debt service coverage ratio |  |  | 345.00% |  |  |
Amortization of debt issuance costs |  |  | $ 500,000 |  | $ 500,000 |
Unamortized debt issuance costs |  |  | 9,100,000 | $ 11,800,000 |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of long-term lines of credit |  |  | $ 220,000,000.0 |  |  |
Letter of Credit | Eurodollar |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.00% |  |  |
Letter of Credit | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.15% |  |  |
Letter of Credit | Federal Funds Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% |  |  |
2019 Class A-2-I Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate (percent) |  |  | 4.194% | 4.194% |  | 4.194%
Debt instrument, face amount |  |  |  |  |  | $ 700,000,000
Quarterly principal payment |  |  | $ 3,250,000 |  |  |
Make-whole premium |  |  | $ 29,000,000 |  |  |
2019 Class A-2-I Notes | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Ratio of indebtedness to net capital |  |  | 525.00% |  |  |
2019 Class A-2-I Notes | Forecast |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional interest on fixed rate |  | 5.00% |  |  |  |
Debt instrument, term |  | 10 years |  |  |  |
2019 Class A-2-I Notes | Forecast | Ten Year United States Treasury Bill Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 2.15% |  |  |  |
2019 Class A-2-II Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate (percent) |  |  | 4.723% | 4.723% |  |
Debt instrument, face amount |  |  |  |  |  | 600,000,000
Make-whole premium |  |  | $ 59,000,000 |  |  |
2019 Class A-2-II Notes | Forecast | Ten Year United States Treasury Bill Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  | 2.64% |  |  |  |
2019 Class A-2 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Quarterly principal payment |  |  | 3,250,000 | $ 3,250,000 |  |
Annual principal payment |  |  | 13,000,000.0 |  |  |
2019 Class A-2 Notes | Forecast |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional interest on fixed rate |  | 5.00% |  |  |  |
Revolver |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate (percent) |  |  |  | 2.42% |  |
Letters of credit outstanding, amount |  |  | 3,300,000 |  |  |
Line of credit facility, current borrowing capacity |  |  | $ 221,700,000 |  |  |
Revolver | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate (percent) |  |  | 2.40% |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 225,000,000 |  |  | $ 225,000,000
Fee on unused portion of line of credit (percent) |  |  | 0.50% |  |  |
Long-term Line of Credit |  |  |  |  | 220,000,000.0 |
Maximum amount outstanding during period |  |  | $ 220,000,000.0 |  |  |
Repayments of long-term lines of credit | $ 220,000,000.0 |  |  |  |  |
Unamortized debt issuance costs |  |  | $ 2,000,000.0 |  |  |
Revolver | Revolving Credit Facility | Eurodollar |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.15% |  |  |
Revolver | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.15% |  |  |
Line Of Credit Facility, Percentage Of Advances Drawn |  |  | 60.00% |  |  |
Revolver | Revolving Credit Facility | Commercial Paper Funding Rate Of Conduit Investor |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.15% |  |  |
Line Of Credit Facility, Percentage Of Advances Drawn |  |  | 40.00% |  |  |
Revolver | Letter of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.15% |  |  |
2018-1 Class A-1 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of debt issuance costs |  |  | $ 200,000 |  | $ 200,000 |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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