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Borrowings - Terms of MetLife Facility (Detail) - MetLife Credit Facility - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Feb. 20, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Aggregate Commitment |  |  | $ 200,000,000.0
Principal Outstanding | $ 37,000,000 |  |
Notes payable to bank |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate Commitment | 75,000,000 | $ 75,000,000.0 |
Principal Outstanding | $ 36,900,000 |  |
Interest rate (as percent) | 2.75% |  |
Undrawn Commitment | $ 38,100,000 |  | $ 21,500,000
Notes payable to bank | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Unused fee (as percent) | 0.10% |  |
Notes payable to bank | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Unused fee (as percent) | 0.20% |  |
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 | $ 24,200,000 |  |
Minimum annualized rate (as percent) | 2.50% |  |
Line of credit | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Unused fee (as percent) | 0.10% |  |
Line of credit | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Unused fee (as percent) | 0.20% |  |
Line of credit | LIBOR |  |  |
Debt Instrument [Line Items] |  |  |
Basis spread (as percent) | 2.00% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: 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 Reference 3: 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 4: 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 + Details
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