XML 331 R235.htm IDEA: XBRL DOCUMENT v2.4.1.9
Plans target allocation by asset category (Detail)
12 Months Ended
Dec. 31, 2014
Equity [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityMember
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum 70.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityMember
Debt Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
Cash and Cash Equivalents [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember