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Consolidated Sponsored Investment Products - Reconciliation of Assets Related to Consolidated Sponsored Investment Products (Detail) - Debt Securities [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 1,065  
Purchases   $ 450
Paydowns (3)  
Transferred to Level 2 (162)  
Change in unrealized gain/(loss), net (48)  
Ending balance $ 852 $ 450