|
Weighted Average Assumptions Used In Determining Benefit Obligations (Detail)
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Discount Rate | 4.20% | 5.00% | 4.20% | 5.00% |
| Pension | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Discount Rate | 4.20% | 5.00% | ||
| Rate of compensation increases | 3.00% | 3.00% | ||
| Health Care And Life | ||||
| Defined Benefit Plan Disclosure [Line Items] | ||||
| Discount Rate | 4.20% | 5.00% |