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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Investment Holdings [Line Items] |
Fair Value | $ 6,412
Unfunded Commitments | $ 1,399
Hedge Funds [Member] |
Investment Holdings [Line Items] |
Investment Redemption Notice Period Minimum | 30 days
Investment Redemption Notice Period Maximum | 120 days
Fair Value | $ 1,647
Unfunded Commitments | $ 0
Redemption Frequency | Annually
Private Equity Funds |
Investment Holdings [Line Items] |
Investments Lock In Period | 10 years
Fair Value | $ 4,765
Unfunded Commitments | $ 1,399

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