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Fair Value Measurements - Investments in Company-Sponsored Funds (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Investment Holdings [Line Items]  
Fair Value $ 8,465us-gaap_InvestmentsFairValueDisclosure
Unfunded Commitments 1,251us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Hedge Funds [Member]  
Investment Holdings [Line Items]  
Fair Value 2,092us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_HedgeFundsMember
Redemption Frequency Quarterly - Annually
Investment Redemption Notice Period Minimum 30 days
Investment Redemption Notice Period Maximum 120 days
Private Equity Funds [Member]  
Investment Holdings [Line Items]  
Fair Value 6,373us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Unfunded Commitments $ 1,251us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
Investments Lock In Period 10 years
Maximum [Member] | Hedge Funds [Member]  
Investment Holdings [Line Items]  
Investments Lock In Period 1 year