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Long-Term Debt (Additional Disclosures) (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 1997
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Weighted average interest rate on all long-term debt   5.50%us-gaap_LongtermDebtWeightedAverageInterestRate 5.50%us-gaap_LongtermDebtWeightedAverageInterestRate
Waste Disposal Revenue Bonds Due 2027 [Member]      
Debt Instrument [Line Items]      
Senior notes, principal amount issued $ 10,889us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= wlk_WasteDisposalRevenueBondsDueTwentyTwentySevenMember		    
Maturity December 2027 2027  
Effective interest rate   0.05%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_LongtermDebtTypeAxis
= wlk_WasteDisposalRevenueBondsDueTwentyTwentySevenMember		 0.09%us-gaap_DebtInstrumentInterestRateAtPeriodEnd
/ us-gaap_LongtermDebtTypeAxis
= wlk_WasteDisposalRevenueBondsDueTwentyTwentySevenMember