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Consolidated Sponsored Investment Products - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Detail) - Consolidated Sponsored Investment Products [Member] - Debt Securities [Member] - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 1,065 | $ 0
Purchases | 135 | 450
Paydowns | (14) | (2)
Sales | (13) | 0
Transferred to Level 2 | (126) | 0
Change in unrealized gain/(loss), net | (121) | (1)
Balance at end of period | $ 926 | $ 447

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- Definition Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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