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Long-Term Debt (Senior Secured Revolving Credit Facility) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Debt Instrument [Line Items]  
Increase in credit facility borrowings $ 25,000,000wlk_LineOfCreditFacilityPermittedIncrease
Senior Secured Revolving Credit Facility [Member]  
Debt Instrument [Line Items]  
Maximum borrowing capacity 400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Amounts drawn under the facility limited to accounts receivable, percentage 85.00%wlk_LineOfCreditFacilityLimitedToAccountsReceivablePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Amounts drawn under the facility limited to eligible inventory, percentage 70.00%wlk_LineOfCreditFacilityLimitedToLesserOfEligibleInventoryPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Amounts drawn under the facility limited to lesser of eligible inventory orderly liquidation, percentage 85.00%wlk_LineOfCreditFacilityLimitedToLesserOfEligibleInventoryOrderlyLiquidationValuePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Amounts drawn under the facility limited to cash held in an account with the agent 100.00%wlk_LineOfCreditFacilityLimitedToCashHeldInAccountWithAgentPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Sub-limit for letters of credit facility 400,000,000wlk_LetterOfCreditFacilitySublimit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Long-term Line of Credit 0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Percentage of commitment on borrowing availability 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Letters of credit outstanding 31,392,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Remaining borrowing capacity 368,608,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Borrowing availability compliance requirements for credit facility 20.00%wlk_LineofCreditFacilityCovenantTermsDistributionsRestrictionsBorrowingAvailabilityThresholdPercentOfCommitmentsScenarioOne
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Borrowing availability compliance requirements for credit facility 80,000,000wlk_LineofCreditFacilityCovenantTermsDistributionsRestrictionsBorrowingAvailabilityThresholdScenarioOne
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Senior Secured Revolving Credit Facility [Member] | LIBOR [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Basis Spread on Variable Rate, Maximum, Provided Company Rated Investment Grade 1.50%wlk_DebtInstrumentBasisSpreadonVariableRateMaximumProvidedCompanyRatedInvestmentGrade
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Senior Secured Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]  
Debt Instrument [Line Items]  
Percentage added to basis to find interest rate 1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Senior Secured Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]  
Debt Instrument [Line Items]  
Percentage added to basis to find interest rate 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
Senior Secured Revolving Credit Facility [Member] | Maximum [Member]  
Debt Instrument [Line Items]  
Increase in credit facility borrowings $ 200,000,000wlk_LineOfCreditFacilityPermittedIncrease
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Senior Secured Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]  
Debt Instrument [Line Items]  
Percentage added to basis to find interest rate 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Senior Secured Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]  
Debt Instrument [Line Items]  
Percentage added to basis to find interest rate 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember