Consolidation - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	$ 59,251	$ 97,384	$ 168,089	$ 203,304
Total investments	95,894	56,738
Total assets	781,304	859,729
Total liabilities	235,493	276,408
Redeemable noncontrolling interest	40,425	73,864
Equity attributable to stockholders of the Company	505,553	509,624
Non-redeemable noncontrolling interest	(167)	(167)
Total liabilities and equity	781,304	859,729
Eliminations and Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	0	0
Total investments	(252,558)	(292,409)
All other assets	(83)	(255)
Total assets	(252,641)	(292,664)
Total liabilities	(83)	(255)
Redeemable noncontrolling interest	40,425	73,864
Equity attributable to stockholders of the Company	(292,983)	(366,273)
Non-redeemable noncontrolling interest	0	0
Total liabilities and equity	(252,641)	(292,664)
Balance Before Consolidation of Investment Products [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	50,402	87,574
Total investments	95,894	56,738
All other assets	17,058	12,814
Balance Before Consolidation of Investment Products [Member] \| Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	50,402	87,574
Total investments	348,452	349,147
All other assets	159,796	162,673
Total assets	558,650	599,394
Total liabilities	53,264	89,937
Redeemable noncontrolling interest	0	0
Equity attributable to stockholders of the Company	505,553	509,624
Non-redeemable noncontrolling interest	(167)	(167)
Total liabilities and equity	558,650	599,394
Consolidated Sponsored Investment Products [Member]
Condensed Financial Statements, Captions [Line Items]
Total investments		323,335
All other assets	63,929	8,549
Total liabilities	20,211	15,387
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Products - VOEs [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	8,759	11,408
Total investments	165,836	291,247
All other assets	59,896	8,281
Total liabilities	17,262	14,948
Redeemable noncontrolling interest	25,214	61,236
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Product - VIE [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	289	458
Total investments	33,794	32,088
All other assets	4,033	268
Total liabilities	2,949	439
Redeemable noncontrolling interest	15,211	12,628
Consolidated Sponsored Investment Products [Member] \| Reportable Legal Entities [Member] \| Consolidated Sponsored Investment Products - VOEs [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	8,759	11,408
Total investments	165,836	291,247
All other assets	59,896	8,281
Total assets	234,491	310,936
Total liabilities	17,323	15,181
Redeemable noncontrolling interest	0	0
Equity attributable to stockholders of the Company	217,168	295,755
Non-redeemable noncontrolling interest	0	0
Total liabilities and equity	234,491	310,936
Consolidated Sponsored Investment Products [Member] \| Reportable Legal Entities [Member] \| Consolidated Sponsored Investment Product - VIE [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	289	458
Total investments	33,794	32,088
All other assets	4,033	268
Total assets	38,116	32,814
Total liabilities	2,971	461
Redeemable noncontrolling interest	0	0
Equity attributable to stockholders of the Company	35,145	32,353
Non-redeemable noncontrolling interest	0	0
Total liabilities and equity	38,116	32,814
Consolidated Investment Product [Member]
Condensed Financial Statements, Captions [Line Items]
Total investments	193,663	199,485
All other assets	1,585	1,467
Consolidated Investment Product [Member] \| Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	7,440	8,297
Total investments	193,663	199,485
All other assets	1,585	1,467
Total assets	202,688	209,249
Total liabilities	162,018	171,084
Redeemable noncontrolling interest	0	0
Equity attributable to stockholders of the Company	40,670	38,165
Non-redeemable noncontrolling interest	0	0
Total liabilities and equity	202,688	209,249
Consolidated Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	66,890	107,737
Total investments	489,187	579,558
All other assets	225,227	172,434
Total assets	781,304	859,729
Total liabilities	235,493	276,408
Redeemable noncontrolling interest	40,425	73,864
Equity attributable to stockholders of the Company	505,553	509,624
Non-redeemable noncontrolling interest	(167)	(167)
Total liabilities and equity	$ 781,304	$ 859,729

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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