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Benefit Plans - Weighted Average Discount Rate non-printing (Detail)
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.89%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate [1] 4.87%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate [1]  
Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate     4.26%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]
Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate     4.87%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]
[1] The discount rate for 2013 increased from 4.26 percent to 4.87 percent due to the plans’ freeze and remeasurement at June 30, 2013.