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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Sum of the carrying amounts as of the balance sheet date of all investments.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Amount of assets classified as other.

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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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Consolidation - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Jun. 09, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	$ 248,676		$ 107,737
Total investments	567,018		579,558
All other assets	159,309		172,434
Total assets	975,003		859,729
Total liabilities	481,752		276,408
Redeemable noncontrolling interest	27,145		73,864	$ 55,577	$ 23,071
Equity attributable to stockholders of the Company	466,273		509,624
Non-redeemable noncontrolling interest	(167)		(167)
Total liabilities and equity	975,003		859,729
Eliminations and Adjustments [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	0		0
Total investments	(132,258)	$ 36,300	(292,409)
All other assets	(223)		(255)
Total assets	(132,481)		(292,664)
Total liabilities	(27,723)		(255)
Redeemable noncontrolling interest	27,145		73,864
Equity attributable to stockholders of the Company	(131,903)		(366,273)
Non-redeemable noncontrolling interest	0		0
Total liabilities and equity	(132,481)		(292,664)
Balance Before Consolidation of Investment Products [Member]
Condensed Financial Statements, Captions [Line Items]
Total investments	91,736		56,738
All other assets	13,404		12,814
Balance Before Consolidation of Investment Products [Member] \| Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	155,532		87,574
Total investments	223,994		349,147
All other assets	150,860		162,673
Total assets	530,386		599,394
Total liabilities	64,280		89,937
Redeemable noncontrolling interest	0		0
Equity attributable to stockholders of the Company	466,273		509,624
Non-redeemable noncontrolling interest	(167)		(167)
Total liabilities and equity	530,386		599,394
Consolidated Sponsored Investment Products [Member]
Condensed Financial Statements, Captions [Line Items]
Total investments	130,396		323,335
All other assets	2,594		8,549
Total liabilities	3,073		15,387
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Products - VOEs [Member]
Condensed Financial Statements, Captions [Line Items]
Total investments	91,669		291,247
All other assets	2,244		8,281
Total liabilities	2,753		14,948
Redeemable noncontrolling interest	7,825		61,236
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Product - VIE [Member]
Condensed Financial Statements, Captions [Line Items]
Total investments	38,727		32,088
All other assets	350		268
Total liabilities	320		439
Redeemable noncontrolling interest	19,320		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	1,209		11,408
Total investments	91,669		291,247
All other assets	2,245		8,281
Total assets	95,123		310,936
Total liabilities	2,814		15,181
Redeemable noncontrolling interest	0		0
Equity attributable to stockholders of the Company	92,309		295,755
Non-redeemable noncontrolling interest	0		0
Total liabilities and equity	95,123		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	891		458
Total investments	38,727		32,088
All other assets	350		268
Total assets	39,968		32,814
Total liabilities	374		461
Redeemable noncontrolling interest	0		0
Equity attributable to stockholders of the Company	39,594		32,353
Non-redeemable noncontrolling interest	0		0
Total liabilities and equity	39,968		32,814
Consolidated Investment Product [Member]
Condensed Financial Statements, Captions [Line Items]
Total investments	344,886		199,485
All other assets	6,078		1,467
Consolidated Investment Product [Member] \| Reportable Legal Entities [Member]
Condensed Financial Statements, Captions [Line Items]
Total cash and cash equivalents	91,044		8,297
Total investments	344,886		199,485
All other assets	6,077		1,467
Total assets	442,007		209,249
Total liabilities	442,007		171,084
Redeemable noncontrolling interest	0		0
Equity attributable to stockholders of the Company	0		38,165
Non-redeemable noncontrolling interest	0		0
Total liabilities and equity	$ 442,007		$ 209,249