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Employee Benefit Plans - Asset Allocation Ranges (Detail)
 12 Months Ended
Dec. 31, 2014
Cash  
Defined Benefit Plan Disclosure [Line Items]  
Minimum % 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ dco_DefinedBenefitPlanByPlanAssetsSecondaryCategoriesAxis
= us-gaap_CashMember
Maximum % 25.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ dco_DefinedBenefitPlanByPlanAssetsSecondaryCategoriesAxis
= us-gaap_CashMember
Fixed income securities  
Defined Benefit Plan Disclosure [Line Items]  
Minimum % 0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ dco_DefinedBenefitPlanByPlanAssetsSecondaryCategoriesAxis
= us-gaap_FixedIncomeSecuritiesMember
Maximum % 50.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ dco_DefinedBenefitPlanByPlanAssetsSecondaryCategoriesAxis
= us-gaap_FixedIncomeSecuritiesMember
Equity securities  
Defined Benefit Plan Disclosure [Line Items]  
Minimum % 50.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum
/ dco_DefinedBenefitPlanByPlanAssetsSecondaryCategoriesAxis
= us-gaap_EquitySecuritiesMember
Maximum % 95.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
/ dco_DefinedBenefitPlanByPlanAssetsSecondaryCategoriesAxis
= us-gaap_EquitySecuritiesMember