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Marketable Securities - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2013 | Aug. 31, 2012 | May 31, 2013 | May 31, 2012 | Apr. 30, 2012 Conversion option, Kemrock 5.5% bonds | May 31, 2013 Conversion option, Kemrock 5.5% bonds | May 31, 2012 Conversion option, Kemrock 5.5% bonds | May 31, 2013 Maximum
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Available-for-sale securities, current | $ 49,100,000 |  | $ 49,100,000 | $ 30,500,000 |  |  |  |
Available-for-sale securities, long-term | 64,000,000 |  | 64,000,000 | 89,600,000 |  |  |  |
Reclassification of other current assets into long term assets |  |  |  | 76,000,000 |  |  |  |
Investment in affiliate |  |  |  |  | 22,700,000 |  | 22,700,000 |
Investment in affiliate, interest rate |  |  |  |  | 5.50% |  | 5.50% |
Debt securities, conversion date, earliest date |  |  |  |  | Jun. 04, 2012 |  | Jun. 04, 2012 |
Debt securities, conversion date, latest date |  |  |  |  | Jun. 12, 2017 |  | Jun. 12, 2017 |
Impairment of investments | 18,500,000 | 40,300,000 | 51,092,000 |  |  | 13,700,000 |  |
Gross gains realized on sales of investments |  |  | 12,300,000 | 4,100,000 |  |  |  |
Gross losses realized on sales of investments |  |  | 600,000 | 5,000,000 |  |  |  |
Losses recognized for securities deemed to have other-than-temporary impairments |  |  | $ 14,300,000 | $ 1,600,000 |  |  |  |
Investments with unrealized loss, percentage of fair values less than original cost |  |  |  |  |  |  |  | 15.00%

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