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Guarantor Disclosures (Condensed Consolidating Financial Information Statement of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |
Net sales | $ 1,942,616 | $ 975,187
Cost of sales | 1,575,473 | 719,602
Gross profit | 367,143 | 255,585
Selling, general and administrative expenses | 123,651 | 53,309
Transaction and integration-related costs | 8,194 | 0
Income (loss) from operations | 235,298 | 202,276
Interest expense | (39,776) | (6,685)
Other income (expense), net | 5,071 | 2,645
Income (loss) before income taxes | (200,593) | (198,236)
Provision for (benefit from) income taxes | 55,883 | 69,300
Equity in net income of subsidiaries | 0 | 0
Net income | 144,710 | 128,936
Net income attributable to noncontrolling interests | 6,520 | 5,808
Net income attributable to Westlake Chemical Corporation | 138,190 | 123,128
Comprehensive income attributable to Westlake Chemical Corporation | 155,860 | 161,757
Westlake Chemical Corporation [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net sales | 0 | 0
Cost of sales | 0 | 0
Gross profit | 0 | 0
Selling, general and administrative expenses | 778 | 607
Transaction and integration-related costs | 0 |
Income (loss) from operations | (778) | (607)
Interest expense | (38,185) | (10,411)
Other income (expense), net | 37,157 | 1,815
Income (loss) before income taxes | 1,806 | 9,203
Provision for (benefit from) income taxes | (5,467) | (3,219)
Equity in net income of subsidiaries | 134,529 | 129,112
Net income | 138,190 | 123,128
Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Westlake Chemical Corporation | 138,190 | 123,128
Comprehensive income attributable to Westlake Chemical Corporation | 155,860 | 161,757
100% Owned Guarantor Subsidiaries [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net sales | 1,579,725 | 761,736
Cost of sales | 1,359,275 | 642,730
Gross profit | 220,450 | 119,006
Selling, general and administrative expenses | 92,260 | 36,996
Transaction and integration-related costs | 8,132 |
Income (loss) from operations | 120,058 | 82,010
Interest expense | (45,677) | (4,851)
Other income (expense), net | (255) | (825)
Income (loss) before income taxes | (74,126) | (76,334)
Provision for (benefit from) income taxes | 53,372 | 62,199
Equity in net income of subsidiaries | 0 | 0
Net income | 20,754 | 14,135
Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Westlake Chemical Corporation | 20,754 | 14,135
Comprehensive income attributable to Westlake Chemical Corporation | 4,635 | 14,341
Non-Guarantor Subsidiaries [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net sales | 736,085 | 569,824
Cost of sales | 582,660 | 427,777
Gross profit | 153,425 | 142,047
Selling, general and administrative expenses | 37,345 | 21,174
Transaction and integration-related costs | 62 |
Income (loss) from operations | 116,018 | 120,873
Interest expense | (806) | 0
Other income (expense), net | 13,061 | 10,232
Income (loss) before income taxes | (128,273) | (131,105)
Provision for (benefit from) income taxes | 7,978 | 10,320
Equity in net income of subsidiaries | 0 | 0
Net income | 120,295 | 120,785
Net income attributable to noncontrolling interests | 6,520 | 5,808
Net income attributable to Westlake Chemical Corporation | 113,775 | 114,977
Comprehensive income attributable to Westlake Chemical Corporation | 122,243 | 149,462
Eliminations [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net sales | (373,194) | (356,373)
Cost of sales | (366,462) | (350,905)
Gross profit | (6,732) | (5,468)
Selling, general and administrative expenses | (6,732) | (5,468)
Transaction and integration-related costs | 0 |
Income (loss) from operations | 0 | 0
Interest expense | 44,892 | 8,577
Other income (expense), net | (44,892) | (8,577)
Income (loss) before income taxes | 0 | 0
Provision for (benefit from) income taxes | 0 | 0
Equity in net income of subsidiaries | (134,529) | (129,112)
Net income | (134,529) | (129,112)
Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Westlake Chemical Corporation | (134,529) | (129,112)
Comprehensive income attributable to Westlake Chemical Corporation | $ (126,878) | $ (163,803)

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