Fair Value Measurements - Investments in Company-Sponsored Funds (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total	Total
Investment Holdings [Line Items]
Fair Value	$ 8,405	$ 8,405
Unfunded Commitments	1,251	1,251
Hedge Funds [Member]
Investment Holdings [Line Items]
Fair Value	2,300	$ 2,300
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	6,105	$ 6,105
Unfunded Commitments	$ 1,251	$ 1,251
Investments Lock In Period	10 years
Maximum [Member] | Hedge Funds [Member]
Investment Holdings [Line Items]
Investments Lock In Period	1 year