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Guarantor Disclosures (Condensed Consolidating Financial Information Balance Sheets) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 372,591 | $ 459,453 | $ 614,976 | $ 662,525
Accounts receivable, net | 1,003,966 | 938,743 |  |
Inventories | 821,708 | 801,100 |  |
Prepaid expenses and other current assets | 43,695 | 48,493 |  |
Restricted cash | 9,328 | 160,527 |  |
Total current assets | 2,251,288 | 2,408,316 |  |
Property, plant and equipment, net | 6,392,745 | 6,420,062 |  |
Goodwill | 950,681 | 946,553 |  |
Customer relationships, net | 596,641 | 611,615 |  |
Other intangible assets, net | 172,697 | 175,839 |  |
Deferred charges and other assets, net | 360,778 | 327,868 |  |
Total other assets, net | 2,080,797 | 2,061,875 |  |
Total assets | 10,724,830 | 10,890,253 |  |
Accounts payable | 543,121 | 496,259 |  |
Accrued liabilities | 400,310 | 537,483 |  |
Term loan | 0 | 149,341 |  |
Total current liabilities | 943,431 | 1,183,083 |  |
Long-term debt, net | 3,601,642 | 3,678,654 |  |
Deferred income taxes | 1,649,120 | 1,650,575 |  |
Pension and other liabilities | 497,805 | 485,896 |  |
Total liabilities | 6,691,998 | 6,998,208 |  |
Total Westlake Chemical Corporation stockholders' equity | 3,659,196 | 3,523,629 |  |
Noncontrolling interests | 373,636 | 368,416 |  |
Total equity | 4,032,832 | 3,892,045 | 3,704,402 | 3,561,931
Total liabilities and equity | 10,724,830 | 10,890,253 |  |
Eliminations [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Accounts receivable, net | (5,294,258) | (4,832,599) |  |
Inventories | 0 | 0 |  |
Prepaid expenses and other current assets | (59,073) | (36,504) |  |
Restricted cash | 0 | 0 |  |
Total current assets | (5,353,331) | (4,869,103) |  |
Property, plant and equipment, net | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Customer relationships, net | 0 | 0 |  |
Other intangible assets, net | 0 | (25,581) |  |
Deferred charges and other assets, net | (10,951,977) | (10,832,054) |  |
Total other assets, net | (10,951,977) | (10,857,635) |  |
Total assets | (16,305,308) | (15,726,738) |  |
Accounts payable | (5,198,283) | (4,807,780) |  |
Accrued liabilities | (155,048) | (61,323) |  |
Term loan |  | 0 |  |
Total current liabilities | (5,353,331) | (4,869,103) |  |
Long-term debt, net | (2,905,713) | (3,997,070) |  |
Deferred income taxes | (23,385) | (22,494) |  |
Pension and other liabilities | (1,115,437) | 0 |  |
Total liabilities | (9,397,866) | (8,888,667) |  |
Total Westlake Chemical Corporation stockholders' equity | (6,907,442) | (6,838,071) |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | (6,907,442) | (6,838,071) |  |
Total liabilities and equity | (16,305,308) | (15,726,738) |  |
Westlake Chemical Corporation [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 54,966 | 146,990 | 263,150 | 303,131
Accounts receivable, net | 2,446,732 | 2,117,540 |  |
Inventories | 0 | 0 |  |
Prepaid expenses and other current assets | 53,239 | 30,748 |  |
Restricted cash | 0 | 0 |  |
Total current assets | 2,554,937 | 2,295,278 |  |
Property, plant and equipment, net | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Customer relationships, net | 0 | 0 |  |
Other intangible assets, net | 0 | 0 |  |
Deferred charges and other assets, net | 9,335,542 | 9,170,042 |  |
Total other assets, net | 9,335,542 | 9,170,042 |  |
Total assets | 11,890,479 | 11,465,320 |  |
Accounts payable | 4,705,704 | 4,330,375 |  |
Accrued liabilities | 17,449 | 26,367 |  |
Term loan |  | 0 |  |
Total current liabilities | 4,723,153 | 4,356,742 |  |
Long-term debt, net | 3,508,130 | 3,584,949 |  |
Deferred income taxes | 0 | 0 |  |
Pension and other liabilities | 0 | 0 |  |
Total liabilities | 8,231,283 | 7,941,691 |  |
Total Westlake Chemical Corporation stockholders' equity | 3,659,196 | 3,523,629 |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | 3,659,196 | 3,523,629 |  |
Total liabilities and equity | 11,890,479 | 11,465,320 |  |
100% Owned Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 5,647 | 53,006 | 1,154 | 6,828
Accounts receivable, net | 3,521,181 | 3,329,871 |  |
Inventories | 605,775 | 597,819 |  |
Prepaid expenses and other current assets | 38,066 | 41,755 |  |
Restricted cash | 2,681 | 0 |  |
Total current assets | 4,173,350 | 4,022,451 |  |
Property, plant and equipment, net | 4,438,292 | 4,475,943 |  |
Goodwill | 791,706 | 791,706 |  |
Customer relationships, net | 453,985 | 468,645 |  |
Other intangible assets, net | 102,339 | 130,243 |  |
Deferred charges and other assets, net | 846,041 | 874,003 |  |
Total other assets, net | 2,194,071 | 2,264,597 |  |
Total assets | 10,805,713 | 10,762,991 |  |
Accounts payable | 761,986 | 748,364 |  |
Accrued liabilities | 357,968 | 389,216 |  |
Term loan |  | 0 |  |
Total current liabilities | 1,119,954 | 1,137,580 |  |
Long-term debt, net | 2,999,225 | 4,090,775 |  |
Deferred income taxes | 1,581,202 | 1,581,260 |  |
Pension and other liabilities | 1,479,584 | 360,622 |  |
Total liabilities | 7,179,965 | 7,170,237 |  |
Total Westlake Chemical Corporation stockholders' equity | 3,625,748 | 3,592,754 |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | 3,625,748 | 3,592,754 |  |
Total liabilities and equity | 10,805,713 | 10,762,991 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and cash equivalents | 311,978 | 259,457 | $ 350,672 | $ 352,566
Accounts receivable, net | 330,311 | 323,931 |  |
Inventories | 215,933 | 203,281 |  |
Prepaid expenses and other current assets | 11,463 | 12,494 |  |
Restricted cash | 6,647 | 160,527 |  |
Total current assets | 876,332 | 959,690 |  |
Property, plant and equipment, net | 1,954,453 | 1,944,119 |  |
Goodwill | 158,975 | 154,847 |  |
Customer relationships, net | 142,656 | 142,970 |  |
Other intangible assets, net | 70,358 | 71,177 |  |
Deferred charges and other assets, net | 1,131,172 | 1,115,877 |  |
Total other assets, net | 1,503,161 | 1,484,871 |  |
Total assets | 4,333,946 | 4,388,680 |  |
Accounts payable | 273,714 | 225,300 |  |
Accrued liabilities | 179,941 | 183,223 |  |
Term loan |  | 149,341 |  |
Total current liabilities | 453,655 | 557,864 |  |
Long-term debt, net | 0 | 0 |  |
Deferred income taxes | 91,303 | 91,809 |  |
Pension and other liabilities | 133,658 | 125,274 |  |
Total liabilities | 678,616 | 774,947 |  |
Total Westlake Chemical Corporation stockholders' equity | 3,281,694 | 3,245,317 |  |
Noncontrolling interests | 373,636 | 368,416 |  |
Total equity | 3,655,330 | 3,613,733 |  |
Total liabilities and equity | $ 4,333,946 | $ 4,388,680 |  |

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