Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Debt Instrument, Number of Classes of Notes

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Investment, Basis Spread on Variable Rate

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Investments, Carrying Amount Exceeds Fair Value

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Number of additional consolidated sponsored investment products.

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Number of sponsored investment products deconsolidated.

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Number of Products Consolidated

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- Definition

Percentage Of Borrowings On Assets Available As Collateral

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Consolidation - Additional Information (Detail)	12 Months Ended
Consolidation - Additional Information (Detail)	Dec. 31, 2016 USD ($) Product	Jun. 09, 2016 USD ($) classes_notes	Dec. 31, 2015 USD ($) Product
VIE, not primary beneficiary [Member]
Variable Interest Entity [Line Items]
Carrying value and maximum risk of loss	$ 9,000,000
Eliminations and adjustments [Member]
Variable Interest Entity [Line Items]
Investments		$ 36,300,000
Consolidated Sponsored Investment Products [Member]
Variable Interest Entity [Line Items]
Fair value, securities, Level 2 to Level 1 transfers, amount	3,700,000		$ 8,400,000
Fair value, securities, Level 1 to Level 2 transfers, amount	0		200,000
Investments	$ 142,075,000		$ 323,335,000
Consolidated Sponsored Investment Products [Member] \| Consolidated Sponsored Investment Products - VOEs [Member]
Variable Interest Entity [Line Items]
Number of consolidated products \| Product	19		12
Number of additional products consolidated during the period \| Product	12
Number products deconsolidated during the period \| Product	5
Investments	$ 99,247,000		$ 291,247,000
Consolidated Sponsored Investment Products [Member] \| Maximum [Member]
Variable Interest Entity [Line Items]
Percentage of total assets permitted to borrow	33.33%
Consolidated Investment Product [Member]
Variable Interest Entity [Line Items]
Debt par value		356,300,000.0
Debt outstanding	$ 0		152,597,000
Investments	$ 346,967,000		$ 199,485,000
Consolidated Investment Product [Member] \| LIBOR [Member]
Variable Interest Entity [Line Items]
Investments, basis spread on variable interest rate	8.25%
Consolidated Investment Product [Member] \| LIBOR [Member] \| Minimum [Member]
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	1.00%
Consolidated Investment Product [Member] \| LIBOR [Member] \| Maximum [Member]
Variable Interest Entity [Line Items]
Basis spread on variable interest rate	8.75%
Consolidated Investment Product [Member] \| CLO senior secured floating rate notes [Member] \| Senior notes [Member]
Variable Interest Entity [Line Items]
Debt par value		$ 320,000,000.0
Number of classes of notes \| classes_notes		6
Unpaid principal balance exceeds fair value	$ 1,300,000
Consolidated Investment Product [Member] \| CLO subordinated notes [Member] \| Subordinated debt [Member]
Variable Interest Entity [Line Items]
Debt par value		$ 36,300,000.0
Consolidated Investment Product [Member] \| CLO warehouse debt [Member] \| Secured debt [Member]
Variable Interest Entity [Line Items]
Debt outstanding		$ 152,600,000