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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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 1,065 $ 0
Purchases 913 1,119
Sales (370) 0
Paydowns (10) (3)
Change in unrealized loss, net (113) (51)
Change in realized loss, net (141) 0
Transfers from Level 2 151 0
Transfers to Level 2 (98) 0
Balance at end of period $ 1,397 $ 1,065