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Fair value measurements - Investments in Company-Sponsored Funds (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 5,373 | $ 5,518
Unfunded Commitments | 1,314 | 2,367
Hedge Funds |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 283 | 446
Unfunded Commitments | $ 0 | $ 0
Hedge Funds | Minimum |  |
Summary of Investment Holdings [Line Items] |  |
Redemption notice period | 30 days | 30 days
Hedge Funds | Maximum |  |
Summary of Investment Holdings [Line Items] |  |
Redemption notice period | 120 days | 120 days
Private Equity Funds |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 5,090 | $ 5,072
Unfunded Commitments | $ 1,314 | $ 2,367

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