Consolidated Sponsored Investment Products - Derivative Instruments (Details) - Consolidated Sponsored Investment Products [Member] $ in Thousands |
Dec. 31, 2015
USD ($)
|
|---|---|
| Options [Member] | Long [Member] | |
| Derivative [Line Items] | |
| Volume | $ 3,015 |
| Options [Member] | Short [Member] | |
| Derivative [Line Items] | |
| Volume | 755 |
| Futures [Member] | |
| Derivative [Line Items] | |
| Volume | 278 |
| Forward foreign currency exchange [Member] | Long [Member] | |
| Derivative [Line Items] | |
| Volume | 5,591 |
| Forward foreign currency exchange [Member] | Short [Member] | |
| Derivative [Line Items] | |
| Volume | 29,069 |
| Interest rate swaps [Member] | |
| Derivative [Line Items] | |
| Volume | 69,094 |
| Other swaps [Member] | |
| Derivative [Line Items] | |
| Volume | $ 35,180 |