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Acquisitions - Intangible Assets (Details) (Niotan Incorporated, USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Feb. 21, 2012
Schedule of the amounts assigned to intangible assets  
Fair Value $ 22,420us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Developed technology  
Schedule of the amounts assigned to intangible assets  
Fair Value 22,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= kem_NiotanIncorporatedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Useful Life (years) 18 years
Software  
Schedule of the amounts assigned to intangible assets  
Fair Value $ 120us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= kem_NiotanIncorporatedMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Useful Life (years) 4 years