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Fair Value Measurements - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value Option Quantitative Disclosures [Line Items] |  |  |
Transfers into or out of Level 3 in the fair value measurement hierarchy | $ 0 | $ 0 | $ 0
Unfunded Commitments | 5,455,000 | $ 5,597,000 |
EGCP III [Member] |  |  |
Fair Value Option Quantitative Disclosures [Line Items] |  |  |
Unfunded Commitments | $ 5,093,000 |  |
End of the investment period | Oct. 12, 2016 |  |
Remaining obligation date | Oct. 12, 2023 |  |

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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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