|
Fair Value of Postretirement Assets (Parenthetical) (Detail)
|
Dec. 31, 2012
|
|---|---|
| Defined Benefit Plan Disclosure [Line Items] | |
| Hedge funds, minimum number of days notice prior to redemption | 30 days |
| Hedge funds, maximum number of days notice prior to redemption | 90 days |
| X | ||||||||||
|
- Definition
Redemption Notice Period, Lower Limit No definition available.
|
| X | ||||||||||
|
- Definition
Redemption Notice Period Upper Limit No definition available.
|
| X | ||||||||||
|
- Details
|