Fair Value Measurements - Investments in Company-Sponsored Funds (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Loan position held in secondary loan trading portfolio		$ 0	$ 0
Fair Value		7,627,000
Unfunded Commitments		1,251,000
Hedge Funds
Investment Holdings [Line Items]
Fair Value	[1]	2,325,000
Unfunded Commitments	[1]	$ 0
Redemption Frequency	[1]	Quarterly - Annually
Redemption notice period, minimum	[1]	30 days
Redemption notice period, maximum	[1]	120 days
Private Equity Funds
Investment Holdings [Line Items]
Fair Value	[2]	$ 5,302,000
Unfunded Commitments	[2]	$ 1,251,000
Investments lock In period		10 years

[1] Includes investments in hedge funds and hedge fund of funds that pursue long/short, event-driven, and activist strategies. Each hedge fund has various restrictions regarding redemption; no investment is locked-up for a period greater than one year.

[2] Includes private equity funds and private equity fund of funds with a focus on diversified portfolios, real estate and global natural resources. Due to the illiquid nature of these funds, investors are not permitted to make withdrawals without the consent of the general partner. The lock-up period of the private equity funds can extend to 10 years.