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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Goodwill [Roll Forward]                
Gross goodwill         $ 239,291us-gaap_GoodwillGross      
Accumulated goodwill impairment         (81,722)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss      
Goodwill 157,569us-gaap_Goodwill 157,569us-gaap_Goodwill 157,569us-gaap_Goodwill 157,569us-gaap_Goodwill 157,569us-gaap_Goodwill 157,569us-gaap_Goodwill 157,569us-gaap_Goodwill 157,569us-gaap_Goodwill
Ducommun AeroStructures                
Goodwill [Roll Forward]                
Gross goodwill         57,243us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunAeroStructuresMember
     
Accumulated goodwill impairment         0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunAeroStructuresMember
     
Goodwill 57,243us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunAeroStructuresMember
      57,243us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunAeroStructuresMember
     
Ducommun LaBarge Technologies                
Goodwill [Roll Forward]                
Gross goodwill         182,048us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunLaBargeTechnologiesMember
     
Accumulated goodwill impairment         (81,722)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunLaBargeTechnologiesMember
     
Goodwill $ 100,326us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunLaBargeTechnologiesMember
      $ 100,326us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dco_DucommunLaBargeTechnologiesMember