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Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 497,631 | $ 439,453 | $ 610,425
Depreciation and amortization | 149,566 | 117,387 |
Deferred income taxes | 34,459 | 83,443 |
Net changes in working capital and other | 94,468 | (92,783) |
Net cash provided by operating activities | 776,124 | 547,500 |
Acquisition of business, net of cash acquired | (611,087) | (178,309) |
Additions to equity investments | 0 | (23,338) |
Additions to property, plant and equipment | (311,183) | (498,290) |
Construction of assets pending sale-leaseback | 0 | (136) |
Proceeds from disposition of assets | 145 | 78 |
Proceeds from repayment of loan acquired | 45,923 | 0 |
Proceeds from repayment of loan to affiliate | 0 | 167 |
Proceeds from sale and maturities of securities | 342,045 | 239,764 |
Purchase of securities and other investments | (117,332) | (232,286) |
Settlements of derivative instruments | (689) | (2,297) |
Net cash used for investing activities | (652,178) | (694,647) |
Intercompany financing | 0 | 0 |
Net distributions prior to WLKP initial public offering | 0 | 0 |
Capitalized debt issuance costs | (1,167) |  |
Dividends paid | (55,690) | (40,204) |
Net proceeds from issuance of Westlake Chemical Partners LP common units | 286,088 | 0 |
Purchase of limited partner interests | 0 |  |
Proceeds from exercise of stock options | 5,502 | 3,182 |
Repurchase of common stock for treasury | (9,495) | (19,409) |
Windfall tax benefits from share-based payment arrangements | 6,670 | 5,056 |
Net cash provided by financing activities | 231,908 | (51,375) |
Effect of exchange rate changes on cash | (3,687) | 0 |
Net increase in cash and cash equivalents | 352,167 | (198,522) |
Cash and cash equivalents at beginning of period | 461,301 | 790,078 | 790,078
Cash and cash equivalents at end of period | 813,468 | 591,556 | 461,301
Westlake Chemical Corporation |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 495,232 | 439,453 |
Depreciation and amortization | 1,172 | 1,094 |
Deferred income taxes | (418) | (1,102) |
Net changes in working capital and other | (509,862) | (458,336) |
Net cash provided by operating activities | (13,876) | (18,891) |
Acquisition of business, net of cash acquired | 0 | 0 |
Additions to equity investments |  | 0 |
Additions to property, plant and equipment | 0 | 0 |
Construction of assets pending sale-leaseback |  | 0 |
Proceeds from disposition of assets | 0 | 0 |
Proceeds from repayment of loan acquired | 0 |  |
Proceeds from repayment of loan to affiliate |  | 0 |
Proceeds from sale and maturities of securities | 342,045 | 239,764 |
Purchase of securities and other investments | (117,332) | (232,286) |
Settlements of derivative instruments | 0 | 0 |
Net cash used for investing activities | 224,713 | 7,478 |
Intercompany financing | 75,104 | (130,832) |
Net distributions prior to WLKP initial public offering | 0 | 0 |
Capitalized debt issuance costs | (1,167) |  |
Dividends paid | (55,690) | (40,204) |
Net proceeds from issuance of Westlake Chemical Partners LP common units | 0 |  |
Purchase of limited partner interests | 0 |  |
Proceeds from exercise of stock options | 5,502 | 3,182 |
Repurchase of common stock for treasury | (9,495) | (19,409) |
Windfall tax benefits from share-based payment arrangements | 6,670 | 5,056 |
Net cash provided by financing activities | 20,924 | (182,207) |
Effect of exchange rate changes on cash | 0 |  |
Net increase in cash and cash equivalents | 231,761 | (193,620) |
Cash and cash equivalents at beginning of period | 420,948 | 753,881 | 753,881
Cash and cash equivalents at end of period | 652,709 | 560,261 |
100% Owned Guarantor Subsidiaries |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 509,404 | 446,858 |
Depreciation and amortization | 82,597 | 59,893 |
Deferred income taxes | 26,991 | 57,279 |
Net changes in working capital and other | (919,521) | (421,066) |
Net cash provided by operating activities | (300,529) | 142,964 |
Acquisition of business, net of cash acquired | 0 | (178,309) |
Additions to equity investments |  | (23,338) |
Additions to property, plant and equipment | (160,147) | (337,158) |
Construction of assets pending sale-leaseback |  | (136) |
Proceeds from disposition of assets | 144 | 6 |
Proceeds from repayment of loan acquired | 0 |  |
Proceeds from repayment of loan to affiliate |  | 0 |
Proceeds from sale and maturities of securities | 0 | 0 |
Purchase of securities and other investments | 0 | 0 |
Settlements of derivative instruments | (556) | 0 |
Net cash used for investing activities | (160,559) | (538,935) |
Intercompany financing | (143,325) | (28,499) |
Net distributions prior to WLKP initial public offering | 448,101 | 421,991 |
Capitalized debt issuance costs | 0 |  |
Dividends paid | 151,729 | 0 |
Net proceeds from issuance of Westlake Chemical Partners LP common units | 0 |  |
Purchase of limited partner interests | 0 |  |
Proceeds from exercise of stock options | 0 | 0 |
Repurchase of common stock for treasury | 0 | 0 |
Windfall tax benefits from share-based payment arrangements | 0 | 0 |
Net cash provided by financing activities | 456,505 | 393,492 |
Effect of exchange rate changes on cash | 0 |  |
Net increase in cash and cash equivalents | (4,583) | (2,479) |
Cash and cash equivalents at beginning of period | 6,227 | 6,973 | 6,973
Cash and cash equivalents at end of period | 1,644 | 4,494 |
OpCo (Less Than 100% Owned Guarantor Subsidiary) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 416,737 | 402,340 |
Depreciation and amortization | 58,501 | 54,539 |
Deferred income taxes | 8,267 | 27,253 |
Net changes in working capital and other | 1,641 | (68,604) |
Net cash provided by operating activities | 485,146 | 415,528 |
Acquisition of business, net of cash acquired | 0 | 0 |
Additions to equity investments |  | 0 |
Additions to property, plant and equipment | (144,348) | (158,869) |
Construction of assets pending sale-leaseback |  | 0 |
Proceeds from disposition of assets | 0 | 0 |
Proceeds from repayment of loan acquired | 0 |  |
Proceeds from repayment of loan to affiliate |  | 0 |
Proceeds from sale and maturities of securities | 0 | 0 |
Purchase of securities and other investments | 0 | 0 |
Settlements of derivative instruments | (133) | (2,297) |
Net cash used for investing activities | (144,481) | (161,166) |
Intercompany financing | 62,221 | 167,629 |
Net distributions prior to WLKP initial public offering | (448,101) | (421,991) |
Capitalized debt issuance costs | 0 |  |
Dividends paid | (151,729) | 0 |
Net proceeds from issuance of Westlake Chemical Partners LP common units | 0 |  |
Purchase of limited partner interests | 286,088 |  |
Proceeds from exercise of stock options | 0 | 0 |
Repurchase of common stock for treasury | 0 | 0 |
Windfall tax benefits from share-based payment arrangements | 0 | 0 |
Net cash provided by financing activities | (251,521) | (254,362) |
Effect of exchange rate changes on cash | 0 |  |
Net increase in cash and cash equivalents | 89,144 | 0 |
Cash and cash equivalents at beginning of period | 0 | 0 | 0
Cash and cash equivalents at end of period | 89,144 | 0 |
Non-Guarantor Subsidiaries |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | (1,441) | (1,639) |
Depreciation and amortization | 7,296 | 1,861 |
Deferred income taxes | (381) | 13 |
Net changes in working capital and other | 599,909 | 7,664 |
Net cash provided by operating activities | 605,383 | 7,899 |
Acquisition of business, net of cash acquired | (611,087) | 0 |
Additions to equity investments |  | 0 |
Additions to property, plant and equipment | (6,688) | (2,263) |
Construction of assets pending sale-leaseback |  | 0 |
Proceeds from disposition of assets | 1 | 72 |
Proceeds from repayment of loan acquired | 45,923 |  |
Proceeds from repayment of loan to affiliate |  | 167 |
Proceeds from sale and maturities of securities | 0 | 0 |
Purchase of securities and other investments | 0 | 0 |
Settlements of derivative instruments | 0 | 0 |
Net cash used for investing activities | (571,851) | (2,024) |
Intercompany financing | 6,000 | (8,298) |
Net distributions prior to WLKP initial public offering | 0 | 0 |
Capitalized debt issuance costs | 0 |  |
Dividends paid | 0 | 0 |
Net proceeds from issuance of Westlake Chemical Partners LP common units | 286,088 |  |
Purchase of limited partner interests | (286,088) |  |
Proceeds from exercise of stock options | 0 | 0 |
Repurchase of common stock for treasury | 0 | 0 |
Windfall tax benefits from share-based payment arrangements | 0 | 0 |
Net cash provided by financing activities | 6,000 | (8,298) |
Effect of exchange rate changes on cash | (3,687) |  |
Net increase in cash and cash equivalents | 35,845 | (2,423) |
Cash and cash equivalents at beginning of period | 34,126 | 29,224 | 29,224
Cash and cash equivalents at end of period | 69,971 | 26,801 |
Eliminations |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | (922,301) | (847,559) |
Depreciation and amortization | 0 | 0 |
Deferred income taxes | 0 | 0 |
Net changes in working capital and other | 922,301 | 847,559 |
Net cash provided by operating activities | 0 | 0 |
Acquisition of business, net of cash acquired | 0 | 0 |
Additions to equity investments |  | 0 |
Additions to property, plant and equipment | 0 | 0 |
Construction of assets pending sale-leaseback |  | 0 |
Proceeds from disposition of assets | 0 | 0 |
Proceeds from repayment of loan acquired | 0 |  |
Proceeds from repayment of loan to affiliate |  | 0 |
Proceeds from sale and maturities of securities | 0 | 0 |
Purchase of securities and other investments | 0 | 0 |
Settlements of derivative instruments | 0 | 0 |
Net cash used for investing activities | 0 | 0 |
Intercompany financing | 0 | 0 |
Net distributions prior to WLKP initial public offering | 0 | 0 |
Capitalized debt issuance costs | 0 |  |
Dividends paid | 0 | 0 |
Net proceeds from issuance of Westlake Chemical Partners LP common units | 0 |  |
Purchase of limited partner interests | 0 |  |
Proceeds from exercise of stock options | 0 | 0 |
Repurchase of common stock for treasury | 0 | 0 |
Windfall tax benefits from share-based payment arrangements | 0 | 0 |
Net cash provided by financing activities | 0 | 0 |
Effect of exchange rate changes on cash | 0 |  |
Net increase in cash and cash equivalents | 0 | 0 |
Cash and cash equivalents at beginning of period | 0 | 0 | 0
Cash and cash equivalents at end of period | $ 0 | $ 0 |

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of common limited partners units during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from long-term debt by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + Details
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- Definition Depreciation and amortization expense, including amortization of debt issuance costs. + References No definition available. + Details
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- Definition The cash outflow associated with the construction of long-lived assets pending financing through a sale-leaseback. + References No definition available. + Details
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