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Fair value measurements - Investments in Company-Sponsored Funds (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Summary of Investment Holdings [Line Items] |  |
Fair Value | $ 5,518 | $ 8,795
Unfunded Commitments | 2,367 | 3,018
Hedge Funds |  |
Summary of Investment Holdings [Line Items] |  |
Fair Value | 446 | 574
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 | $ 5,072 | $ 8,221
Unfunded Commitments | $ 2,367 | $ 3,018

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