|
Fair Values of Derivative Instruments Included on the Consolidated Balance Sheet (Parenthetical) (Detail) (USD $)
In Millions |
Dec. 31, 2010
|
|---|---|
| Derivatives, Fair Value [Line Items] | |
| Derivatives asset fair value measurements netting adjustment | $ 0.3 |
| Derivatives liability fair value measurements netting adjustment | $ 0.3 |