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Subsequent Events (Details) (Affiliates [Member], Suzhou Huasu Plastics Company Ltd [Member])
Dec. 31, 2014
Feb. 25, 2015
Subsequent Event [Line Items]    
Ownership interest 59.00%us-gaap_EquityMethodInvestmentOwnershipPercentage  
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Percentage of interest acquired   35.70%wlk_BusinessAcquisitionPercentageofVotingInterestsAgreedToBeAcquired
/ us-gaap_CounterpartyNameAxis
= wlk_SuzhouHuasuPlasticsCompanyLtdMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember