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Consolidation - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Detail) - Consolidated investment products - Debt investments - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 25 | $ 1,397
Purchases | 3,174 | 174
Sales | (3,357) | (1,472)
Paydowns | 0 | (5)
Amortization | 9 | 0
Change in unrealized gains (losses), net | 434 | 348
Realized gains (loss), net | (49) | (355)
Acquired in business combination | 9,151 | 0
Transfers to Level 2 | (35,258) | 0
Transfers from Level 2 | 60,652 | (62)
Balance at end of period | $ 34,781 | $ 25

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for 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)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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