Consolidation - Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Total cash and cash equivalents	$ 179,273	$ 97,384	$ 128,847	$ 203,304
Total liabilities	(429,464)	(276,408)
Redeemable noncontrolling interests	(30,301)	(73,864)	$ (49,895)	$ (23,071)
Consolidated Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Total investments	137,140	323,335
All other assets	2,560	8,549
Total liabilities	(2,930)	(15,387)
Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Total cash equivalents	12,703	8,297
Total investments	360,210	199,485
All other assets	4,628	1,467
Debt	0	(152,597)
Notes payable	(323,852)	0
Securities purchased payable and other liabilities	(25,704)	(18,487)
The Company’s net interests in consolidated sponsored investment products	27,985	38,165
Consolidated Sponsored Investment Products - VOEs [Member] \| Consolidated Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Total cash and cash equivalents	1,961	11,408
Total investments	95,452	291,247
All other assets	1,943	8,281
Total liabilities	(2,538)	(14,948)
Redeemable noncontrolling interests	(8,816)	(61,236)
The Company’s net interests in consolidated sponsored investment products	88,002	234,752
Consolidated Sponsored Investment Product - VIE [Member] \| Consolidated Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Total cash and cash equivalents	132	458
Total investments	41,688	32,088
All other assets	617	268
Total liabilities	(392)	(439)
Redeemable noncontrolling interests	(21,485)	(12,628)
The Company’s net interests in consolidated sponsored investment products	$ 20,560	$ 19,747

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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