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Investment in Kemrock Industries and Exports Ltd - Additional Information (Detail) | 3 Months Ended |  |  | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Aug. 31, 2012 USD ($) | Aug. 31, 2012 INR | May 31, 2012 INR | Aug. 31, 2012 Kemrock Industries and Exports Limited USD ($) | May 31, 2012 Kemrock Industries and Exports Limited USD ($) | May 31, 2011 Kemrock Industries and Exports Limited | May 31, 2012 Kemrock global depository receipts USD ($) | Apr. 30, 2012 Conversion option, Kemrock 5.5% bonds USD ($) | Aug. 31, 2012 Conversion option, Kemrock 5.5% bonds | May 31, 2012 Conversion option, Kemrock 5.5% bonds USD ($) | Apr. 30, 2012 Conversion option, Kemrock 5.5% bonds Minimum | May 31, 2012 Conversion option, Kemrock 5.5% bonds Minimum | Apr. 30, 2012 Conversion option, Kemrock 5.5% bonds Maximum | May 31, 2012 Conversion option, Kemrock 5.5% bonds Maximum
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advances to affiliate |  |  |  |  | $ 15,000,000 |  |  |  |  |  |  |  |  |
Agreement expiration period |  |  |  |  | Sep. 15, 2012 |  |  |  |  |  |  |  |  |
Acquisition of equity method investment, shares |  |  |  |  | 870,000 | 3,200,000 | 693,072 |  |  |  |  |  |  |
Purchase of global depository receipt, value |  |  |  |  |  |  | 7,200,000 |  |  |  |  |  |  |
Equity method investment carrying value |  |  |  |  |  |  | 42,200,000 |  |  |  |  |  |  |
Investment in affiliate |  |  |  |  |  |  |  | 22,700,000 |  | 22,700,000 |  |  |  |
Investment in affiliate, interest rate |  |  |  |  |  |  |  | 5.50% | 5.50% | 5.50% |  |  |  |
Debt securities, conversion date |  |  |  |  |  |  |  |  |  |  | Jun. 04, 2012 | Jun. 04, 2012 | Jun. 12, 2017 | Jun. 12, 2017
Kemrock common stock market value per share |  | 116.6 | 531.0 |  |  |  |  |  |  |  |  |  |  |
Impairment loss on equity method investment | (32,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from affiliate |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Loans deemed uncollectible, recorded as loss |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Loss on Kemrock conversion option | $ (8,183,000) |  |  |  |  |  |  |  |  |  |  |  |  |

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