Consolidation - Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Total liabilities	$ (465,449)	$ (276,408)
Redeemable noncontrolling interests	(37,266)	(73,864)	$ (23,071)	$ (42,186)
Consolidated Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Total cash	3,650	1,513
Total investments	142,075	323,335
All other assets	3,270	8,549
Total liabilities	(4,109)	(15,387)
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Products - VOEs [Member]
Variable Interest Entity [Line Items]
Total cash	1,859	11,408
Total investments	99,247	291,247
All other assets	2,211	8,281
Total liabilities	(2,310)	(14,948)
Redeemable noncontrolling interests	(12,505)	(61,236)
The Company’s net interests in consolidated sponsored investment products	88,502	234,752
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Product - VIE [Member]
Variable Interest Entity [Line Items]
Total cash	2,775	458
Total investments	42,828	32,088
All other assets	1,059	268
Total liabilities	(1,799)	(439)
Redeemable noncontrolling interests	(24,761)	(12,628)
The Company’s net interests in consolidated sponsored investment products	20,102	19,747
Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Total cash equivalents	14,449	8,297
Total investments	346,967	199,485
All other assets	5,888	1,467
Debt	0	(152,597)
Notes payable	(328,761)	0
Securities purchased payable and other liabilities	(12,534)	(18,487)
The Company’s net interests in consolidated sponsored investment products	$ 26,009	$ 38,165

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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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