| Long-Term Debt - Summary of Maximum Senior Leverage Ratio Required to Maintain for Vintage Stock (Details) | 3 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | |
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 200.00% | ||||||||||
| Maximum | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 200.00% | ||||||||||
| Maximum | Subsequent Event | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 200.00% | ||||||||||
| Maximum | Scenario Forecast | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 200.00% | ||||||||||
| Maximum | Vintage Stock | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 240.00% | 240.00% | 240.00% | 260.00% | 265.00% | ||||||
| Maximum | Vintage Stock | Subsequent Event | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 220.00% | ||||||||||
| Maximum | Vintage Stock | Scenario Forecast | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 155.00% | 160.00% | 185.00% | 205.00% | 210.00% | ||||||
| Minimum | |||||||||||
| Debt Instrument [Line Items] | |||||||||||
| Senior leverage ratio | 200.00% | ||||||||||