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Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Operations) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net sales | $ 1,253,227 | $ 1,004,165 | $ 3,279,479 | $ 2,807,859 |
Cost of sales | 891,707 | 699,694 | 2,324,978 | 2,002,092 |
Gross profit | 361,520 | 304,471 | 954,501 | 805,767 |
Selling, general and administrative expenses | 54,759 | 37,869 | 132,897 | 109,883 |
Income from operations | 306,761 | 266,602 | 821,604 | 695,884 |
Interest expense | (9,486) | (3,297) | (28,182) | (14,921) |
Other (expense) income, net | (2,670) | (287) | 4,440 | 3,137 |
Income before income taxes | 294,605 | 263,018 | 797,862 | 684,100 |
Provision for (benefit from) income taxes | 124,449 | 92,728 | 300,231 | 244,647 |
Equity in net income of subsidiaries | 0 | 0 | 0 | 0 |
Net income | 170,156 | 170,290 | 497,631 | 439,453 | 610,425
Net income attributable to noncontrolling interests | 2,399 | 0 | 2,399 | 0 |
Net income to Westlake Chemical Corporation | 167,757 | 170,290 | 495,232 | 439,453 |
Comprehensive income (loss) | 131,456 | 171,095 | 461,415 | 439,372 |
Westlake Chemical Corporation |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net sales | 0 | 0 | 0 | 0 |
Cost of sales | 0 | 0 | 0 | 0 |
Gross profit | 0 | 0 | 0 | 0 |
Selling, general and administrative expenses | 399 | 514 | 1,474 | 1,576 |
Income from operations | (399) | (514) | (1,474) | (1,576) |
Interest expense | (10,343) | (3,292) | (29,032) | (14,882) |
Other (expense) income, net | 2,138 | 3,585 | 14,488 | 7,490 |
Income before income taxes | (8,604) | (221) | (16,018) | (8,968) |
Provision for (benefit from) income taxes | (3,088) | (70) | (5,686) | (3,202) |
Equity in net income of subsidiaries | 173,273 | 170,441 | 505,564 | 445,219 |
Net income | 167,757 |  | 495,232 | 439,453 |
Net income attributable to noncontrolling interests | 0 |  | 0 |  |
Net income to Westlake Chemical Corporation | 167,757 | 170,290 | 495,232 | 439,453 |
Comprehensive income (loss) | 131,456 | 171,095 | 461,415 | 439,372 |
100% Owned Guarantor Subsidiaries |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net sales | 1,026,282 | 844,081 | 2,809,844 | 2,407,341 |
Cost of sales | 831,675 | 754,037 | 2,476,608 | 2,247,338 |
Gross profit | 194,607 | 90,044 | 333,236 | 160,003 |
Selling, general and administrative expenses | 36,445 | 29,323 | 123,050 | 84,152 |
Income from operations | 158,162 | 60,721 | 210,186 | 75,851 |
Interest expense | (2) | (5) | (8) | (39) |
Other (expense) income, net | (2,942) | (2,688) | (1,729) | (4,002) |
Income before income taxes | 155,218 | 58,028 | 208,449 | 71,810 |
Provision for (benefit from) income taxes | 93,366 | 19,973 | 109,920 | 27,292 |
Equity in net income of subsidiaries | 113,157 | 132,581 | 410,875 | 402,340 |
Net income | 175,009 |  | 509,404 | 446,858 |
Net income attributable to noncontrolling interests | 0 |  | 0 |  |
Net income to Westlake Chemical Corporation | 175,009 | 170,636 | 509,404 | 446,858 |
Comprehensive income (loss) | 175,137 | 170,764 | 509,787 | 447,490 |
OpCo (Less Than 100% Owned Guarantor Subsidiary) |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net sales | 392,008 | 540,133 | 1,476,157 | 1,565,809 |
Cost of sales | 227,015 | 327,152 | 832,304 | 924,663 |
Gross profit | 164,993 | 212,981 | 643,853 | 641,146 |
Selling, general and administrative expenses | 8,014 | 6,391 | 21,957 | 19,326 |
Income from operations | 156,979 | 206,590 | 621,896 | 621,820 |
Interest expense | (2,137) | (2,295) | (9,833) | (4,893) |
Other (expense) income, net | 486 | 1,162 | 3,135 | 6,422 |
Income before income taxes | 155,328 | 205,457 | 615,198 | 623,349 |
Provision for (benefit from) income taxes | 36,309 | 72,876 | 198,461 | 221,009 |
Equity in net income of subsidiaries | 0 | 0 | 0 | 0 |
Net income | 119,019 |  | 416,737 | 402,340 |
Net income attributable to noncontrolling interests | 0 |  | 0 |  |
Net income to Westlake Chemical Corporation | 119,019 | 132,581 | 416,737 | 402,340 |
Comprehensive income (loss) | 119,019 | 132,581 | 416,737 | 402,340 |
Non-Guarantor Subsidiaries |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net sales | 208,313 | 13,337 | 229,183 | 37,561 |
Cost of sales | 202,110 | 11,891 | 221,233 | 32,943 |
Gross profit | 6,203 | 1,446 | 7,950 | 4,618 |
Selling, general and administrative expenses | 14,184 | 1,641 | 16,954 | 4,829 |
Income from operations | (7,981) | (195) | (9,004) | (211) |
Interest expense | (39) | 0 | (39) | 0 |
Other (expense) income, net | 683 | (51) | (724) | (1,880) |
Income before income taxes | (7,337) | (246) | (9,767) | (2,091) |
Provision for (benefit from) income taxes | (2,138) | (51) | (2,464) | (452) |
Equity in net income of subsidiaries | 5,862 | 0 | 5,862 | 0 |
Net income | 663 |  | (1,441) | (1,639) |
Net income attributable to noncontrolling interests | 2,399 |  | 2,399 |  |
Net income to Westlake Chemical Corporation | (1,736) | (195) | (3,840) | (1,639) |
Comprehensive income (loss) | (39,528) | 351 | (41,722) | (2,483) |
Eliminations |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |
Net sales | (373,376) | (393,386) | (1,235,705) | (1,202,852) |
Cost of sales | (369,093) | (393,386) | (1,205,167) | (1,202,852) |
Gross profit | (4,283) | 0 | (30,538) | 0 |
Selling, general and administrative expenses | (4,283) | 0 | (30,538) | 0 |
Income from operations | 0 | 0 | 0 | 0 |
Interest expense | 3,035 | 2,295 | 10,730 | 4,893 |
Other (expense) income, net | (3,035) | (2,295) | (10,730) | (4,893) |
Income before income taxes | 0 | 0 | 0 | 0 |
Provision for (benefit from) income taxes | 0 | 0 | 0 | 0 |
Equity in net income of subsidiaries | (292,292) | (303,022) | (922,301) | (847,559) |
Net income | (292,292) |  | (922,301) | (847,559) |
Net income attributable to noncontrolling interests | 0 |  | 0 |  |
Net income to Westlake Chemical Corporation | (292,292) | (303,022) | (922,301) | (847,559) |
Comprehensive income (loss) | $ (254,628) | $ (303,696) | $ (884,802) | $ (847,347) |

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