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Senior Debt - Summary of Debt (Parenthetical) (Detail) - Term Loan [Member] $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Debt Instrument [Line Items] |
Frequency of periodic payment | quarterly
Term loans, year of maturity | Jun. 30, 2024
Debt Instrument, Redemption, Through June 2023 [Member] |
Debt Instrument [Line Items] |
Outstanding borrowings, quarterly principal installments payable amount | $ 0.9
Debt Instrument, Redemption, Thereafter [Member] |
Debt Instrument [Line Items] |
Outstanding borrowings, quarterly principal installments payable amount | $ 1.3

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