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Guarantor Disclosures (Additional Information) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]  
Less than percentage owned in subsidiary 100.00%wlk_ConsolidationLessthanWhollyOwnedSubsidiaryParentOwnershipInterestPercent
3.60% Senior Notes Due 2022  
Condensed Financial Statements, Captions [Line Items]  
Stated interest rate 3.60%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= wlk_ThreePointSixZeroPercentageSeniorNotesDueTwentyTwentyTwoMember
Maturity 2022
Minimum debt amount guaranteed by subsidiaries 5,000wlk_DebtAmountInExcessOfGuaranteedBySubsidiaries
/ us-gaap_LongtermDebtTypeAxis
= wlk_ThreePointSixZeroPercentageSeniorNotesDueTwentyTwentyTwoMember