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Fair value measurements - Investments in Company-Sponsored Funds (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Investment Holdings [Line Items] |  |
Fair Value | $ 8,795 | $ 5,521
Unfunded Commitments | 3,018 | 4,035
Hedge Funds |  |
Investment Holdings [Line Items] |  |
Fair Value | 574 | 900
Unfunded Commitments | $ 0 | $ 0
Hedge Funds | Minimum |  |
Investment Holdings [Line Items] |  |
Redemption notice period | 30 days | 30 days
Hedge Funds | Maximum |  |
Investment Holdings [Line Items] |  |
Redemption notice period | 120 days | 120 days
Private Equity Funds |  |
Investment Holdings [Line Items] |  |
Fair Value | $ 8,221 | $ 4,621
Unfunded Commitments | $ 3,018 | $ 4,035

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