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Consolidation - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Detail) - Consolidated investment products - Debt investments - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Balance at beginning of period | $ 34,781 | $ 25
Realized gains (losses), net | 1,993 | (4)
Change in unrealized gains (losses), net | 575 | 0
Acquired in business combination | 0 | 9,150
Purchases | 7,122 | 100
Paydowns | 0 | 0
Amortization | 19 | 0
Sales | (13,884) | (121)
Transfers to Level 2 | (30,606) | 0
Transfers from Level 2 | 3,514 | 0
Balance at end of period | $ 3,514 | $ 9,150

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