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Pension and Employee Benefit Plans - Details of Defined Benefit Pension Plan Asset Allocation by Asset Category (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations  
Percentage of Plan Asset 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 70.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember		  
Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Allocation 30.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember		  
Minimum [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Asset 64.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 64.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Asset 33.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 27.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Asset 67.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 73.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Asset 36.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 36.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember