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Reconciliation Of Changes In Benefit Obligations And Fair Value Of Plan Assets (Parenthetical) (Detail) (Pension Plans, U S Plans, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Pension Plans | U S Plans |
Defined Benefit Plan Disclosure [Line Items] |
Employer contributions, discretionary contribution | $ 10.0

X
- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration