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Borrowings - Terms of MetLife Facility (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Principal Outstanding | $ 671,573,000 |
MetLife Credit Facility |  |
Debt Instrument [Line Items] |  |
Aggregate Commitment |  | $ 200,000,000
Principal Outstanding | 37,000,000 |
MetLife Credit Facility | Notes payable to bank |  |
Debt Instrument [Line Items] |  |
Aggregate Commitment | 75,000,000 |
Principal Outstanding | $ 36,900,000 |
Interest Rate Terms | 2.75% |
Undrawn Commitment | $ 38,100,000 | $ 21,500,000
MetLife Credit Facility | Notes payable to bank | Minimum |  |
Debt Instrument [Line Items] |  |
Unused fee | 0.10% |
MetLife Credit Facility | Notes payable to bank | Maximum |  |
Debt Instrument [Line Items] |  |
Unused fee | 0.20% |
MetLife Credit Facility | Line of credit |  |
Debt Instrument [Line Items] |  |
Aggregate Commitment | $ 75,000,000 |
Principal Outstanding | 100,000 |
Undrawn Commitment | 74,900,000 |
Long-term debt, additional amount available | $ 58,400,000 |
Minimum annualized rate | 2.50% |
MetLife Credit Facility | Line of credit | Minimum |  |
Debt Instrument [Line Items] |  |
Unused fee | 0.10% |
MetLife Credit Facility | Line of credit | Maximum |  |
Debt Instrument [Line Items] |  |
Unused fee | 0.20% |
MetLife Credit Facility | Line of credit | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest Rate Terms | 2.00% |

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