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Consolidation - Assets Related to Consolidated Sponsored Investment Products, Unobservable Input Reconciliation (Detail) - Consolidated Sponsored Investment Products [Member] - Debt Securities [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 1,397 $ 1,065
Realized losses, net (102) 0
Purchases 19 0
Paydowns (1) (1)
Sales (498) 0
Transferred to Level 2 (618) (152)
Transfers from Level 2 710 0
Change in unrealized gain/(loss), net 89 1
Balance at end of period $ 996 $ 913