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Acquisitions and Divestitures - Additional Information (Detail)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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Dec. 31, 2014
EUR (€)
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Jun. 17, 2010
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Jun. 30, 2015
Scenario Forecast [Member]
EUR (€)
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Apr. 30, 2014
Livorno, Italy [Member]
USD ($)
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Apr. 30, 2014
Livorno, Italy [Member]
EUR (€)
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Dec. 31, 2014
Livorno, Italy [Member]
USD ($)
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Dec. 31, 2014
Styron Holdcos [Member]
USD ($)
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Dec. 31, 2013
Styron Holdcos [Member]
USD ($)
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Dec. 31, 2012
Styron Holdcos [Member]
USD ($)
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Mar. 02, 2010
Styron Holdcos [Member]
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Mar. 31, 2014
Expandable Polystyrene Business [Member]
USD ($)
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Sep. 30, 2013
Expandable Polystyrene Business [Member]
USD ($)
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Dec. 31, 2013
Expandable Polystyrene Business [Member]
USD ($)
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Dec. 31, 2014
Minimum [Member]
lb
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Dec. 31, 2014
Maximum [Member]
lb
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| Business Acquisition [Line Items] | |||||||||||||||||
| Equity interest acquired | 100.00% | 100.00% | |||||||||||||||
| Increase to goodwill | $ 1,679,000 | ||||||||||||||||
| Indemnity payments received | 0 | 6,700,000 | 0 | ||||||||||||||
| Sales proceeds | 14,566,000 | 15,200,000 | |||||||||||||||
| Business disposition, working capital adjustment paid | 700,000 | 700,000 | |||||||||||||||
| Recognized loss from sale of business | 4,200,000 | ||||||||||||||||
| Supply agreement term | 10 years | ||||||||||||||||
| Quantity of styrene monomer to be supplied | 77,000,000 | 132,000,000 | |||||||||||||||
| Production percentage | 70.00% | 100.00% | |||||||||||||||
| Incremental payment | 500,000 | ||||||||||||||||
| Contingent gain on sale, related to incremental payment | 600,000 | 500,000 | |||||||||||||||
| Sale of portion of land | 6,800,000 | 4,950,000 | |||||||||||||||
| Gain on sale of property held-for-sale | $ 100,000 | ||||||||||||||||