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Other Assets (Additional Information) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Other Assets [Line Items] |  |  |  |
Amortization expense on intangible assets, included in other assets | $ 9,283 | $ 8,634 | $ 26,566 | $ 21,392
Olefins |  |  |  |
Other Assets [Line Items] |  |  |  |
Goodwill | 29,990 |  | 29,990 |
Vinyls |  |  |  |
Other Assets [Line Items] |  |  |  |
Goodwill | $ 32,026 |  | $ 32,026 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amortization of other assets + References No definition available. + Details
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