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Investments - Additional Information (Detail) (USD $)	6 Months Ended
Investments - Additional Information (Detail) (USD $)	Jun. 30, 2012	Jun. 30, 2012 Joint Venture Saudi Organometallic Chemicals Company	Jun. 30, 2013 Stannica LLC	Dec. 31, 2012 Stannica LLC
Schedule of Investments [Line Items]
Carrying value of unconsolidated investment			$ 6,000,000	$ 6,600,000
Long-term advances to joint venture	$ 10,000,000	$ 10,000,000
Percentage of interest in joint ventures		50.00%

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

The cash outflow from advancing money to an affiliate (an entity that is related but not strictly controlled by the entity).