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Segment Information (Total Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 5,179,785us-gaap_Assets $ 5,213,990us-gaap_Assets
Olefins    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 1,783,845us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wlk_OlefinsMember		 1,785,895us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wlk_OlefinsMember
Vinyls    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 2,510,470us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wlk_VinylsMember		 2,618,646us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= wlk_VinylsMember
Corporate and Other    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 885,470us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 $ 809,449us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember