Investments of Operating Entities and Consolidated Funds - Other Investments - Quarterly (Details) - USD ($) $ in Thousands	Dec. 31, 2016		Dec. 31, 2015
Investment Holdings [Line Items]
Other investments	$ 157,279		$ 141,647
Portfolio Funds, at fair value
Investment Holdings [Line Items]
Other investments	120,023	[1]	114,281	[2]
Equity Method Investments
Investment Holdings [Line Items]
Other investments	36,991		27,067
Lehman claims, at fair value
Investment Holdings [Line Items]
Other investments	$ 265		$ 299

[1] In accordance with US GAAP, certain investments that are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statement of financial condition.

[2] In accordance with US GAAP, certain investments that are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated statement of financial condition.