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v3.20.4

Indebtedness - New Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized debt issuance costs |  |  | $ 31,819 | $ 30,625 |  |
9.25% Senior Notes Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  | $ 550,000 |  |  | $ 300,000 |
Interest rate on notes |  | 9.25% | 9.25% | 9.25% |  |
Debt instrument maturity year |  | 2026 |  |  |  |
Net proceeds after underwriting expenses |  | $ 541,400 |  |  | 295,000 |
Unamortized debt issuance costs |  | 8,600 |  |  | $ 5,000 |
Maximum redemption price of notes as percentage of principal amount |  |  | 100.00% |  |  |
5.75% Senior Notes Due 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on notes |  |  | 5.75% | 5.75% | 5.75% | 5.75%
Repayments of senior notes |  | $ 500,000 |  |  |  |
8.25% Senior Notes Due 2029 | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 600,000 |  |  |  |  |
Interest rate on notes | 8.25% |  |  |  |  |
Debt instrument maturity year | 2029 |  |  |  |  |
Net proceeds after underwriting expenses | $ 590,800 |  |  |  |  |
Unamortized debt issuance costs | $ 9,200 |  |  |  |  |
Maximum redemption price of notes as percentage of principal amount | 100.00% |  |  |  |  |

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