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Investments - Additional Information (Detail) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2012 Joint Venture Saudi Organometallic Chemicals Company | Sep. 30, 2013 Stannica LLC | Dec. 31, 2012 Stannica LLC
Schedule of Investments [Line Items] |  |  |  |  |
Carrying value of unconsolidated investment |  |  |  | $ 5,500,000 | $ 6,600,000
Long-term advances to joint venture | $ 0 | $ 22,500,000 | $ 22,500,000 |  |
Percentage of interest in joint ventures |  |  | 50.00% |  |

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