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Company's Investment Policy Targets and Ranges for Each Asset Category (Detail)
 12 Months Ended
Dec. 31, 2014
U.S. Plans | Equity Securities  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 58.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Minimum 52.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 64.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
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= us-gaap_EquitySecuritiesMember
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U.S. Plans | Debt Securities  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 36.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Minimum 33.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 39.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
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= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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U.S. Plans | Real Estate  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 6.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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= us-gaap_RealEstateMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Minimum 3.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
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= us-gaap_RealEstateMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 9.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_RealEstateMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
U.S. Plans | Cash  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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U.S. Plans | Other  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherInvestmentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
International Plans | Equity Securities  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 38.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Minimum 32.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 44.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Debt Securities  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 55.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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Defined Benefit Plan Target Plan Asset Allocations Range Minimum 48.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
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= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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Defined Benefit Plan Target Plan Asset Allocations Range Maximum 62.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
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= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Real Estate  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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Defined Benefit Plan Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
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= us-gaap_RealEstateMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 3.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
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= us-gaap_RealEstateMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Cash  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
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/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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Defined Benefit Plan Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
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= us-gaap_CashMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
International Plans | Other  
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]  
Defined benefit plan target allocation percentage of assets 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
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Defined Benefit Plan Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
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= us-gaap_OtherInvestmentsMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Defined Benefit Plan Target Plan Asset Allocations Range Maximum 10.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
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= us-gaap_OtherInvestmentsMember
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