Contingencies, Commitments, and Guarantees - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
Commitments and Contingencies Disclosure [Abstract] | |||
Litigation Related Reserve Activity, Net | $ 0.8 | $ (4.1) | $ 0.9 |
Remaining Capital Commitments To Investment Vehicles | $ 37.3 |