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Guarantor Disclosures (Additional Information) (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 USD ($)
Condensed Financial Statements, Captions [Line Items] |
Equity Method Investment, Ownership Percentage | 100.00%
3.60%, 5.0%, 4.625%, 4.875% Senior Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Minimum debt amount guaranteed by subsidiaries | $ 5,000
3.60% Senior Notes Due 2022 [Member] | Senior Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Debt Instrument Maturity | 2022
3.6% Senior Notes Due 2026 [Member] | Senior Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Debt Instrument Maturity | 2026
5% Senior Notes Due 2046 [Member] | Senior Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Debt Instrument Maturity | 2046
4.625% Senior Notes Due 2021 (New Westlake 2021 Notes) [Member] | Senior Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Debt Instrument Maturity | 2021
4.875% Senior Notes Due 2023 (New Westlake 2023 Notes) [Member] | Senior Notes [Member] |
Condensed Financial Statements, Captions [Line Items] |
Debt Instrument Maturity | 2023

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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