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Fair Value Measurements - Fair Value of Certain Investments Based on NAV (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 64,968 | $ 71,135
Unfunded Commitments | 5,455 | 5,597
Hedge Funds [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 29,259 | $ 24,162
Hedge Funds [Member] | Monthly [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Percent | 68.00% | 79.00%
Hedge Funds [Member] | Quarterly [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Percent | 32.00% | 21.00%
Hedge Funds [Member] | Minimum [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Redemption Notice Period | 30 days | 30 days
Hedge Funds [Member] | Maximum [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Redemption Notice Period | 60 days | 60 days
Other [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 615 | $ 623
Other [Member] | Monthly [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Percent | 95.00% | 92.00%
Other [Member] | Daily [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Percent | 5.00% | 8.00%
Other [Member] | Minimum [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Redemption Notice Period | 30 days | 30 days
Other [Member] | Maximum [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Redemption Notice Period | 30 days | 30 days
Debt Funds [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 4 | $ 5
Investments Redeemable, Redemption Notice Period | 30 days | 30 days
Debt Funds [Member] | Daily [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Percent | 100.00% | 100.00%
Equity Funds [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 40 | $ 49
Equity Funds [Member] | Annually [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Percent | 65.00% | 64.00%
Equity Funds [Member] | Monthly [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Percent | 35.00% | 36.00%
Equity Funds [Member] | Minimum [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Redemption Notice Period | 30 days | 30 days
Equity Funds [Member] | Maximum [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Investments Redeemable, Redemption Notice Period | 60 days | 60 days
Private Equity Funds [Member] | Equity Growth [Member] |  |
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items] |  |
Fair Value | $ 35,050 | $ 46,296
Unfunded Commitments | $ 5,455 | $ 5,597
% of Fair Value Not Redeemable | 100.00% | 100.00%

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- Definition States the percentage with which the entity can redeem its investment, or portion thereof, per period (for example, annually, semi-annually, quarterly) for each of those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments), by major category. + References No definition available. + Details
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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI https://asc.fasb.org/extlink&oid=126972413&loc=SL7495116-110257 + Details
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- Definition Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=SL6742756-110258 + Details
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