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Segment Reporting (Narrative) (Detail)
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9 Months Ended |
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Sep. 30, 2012
Facility
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U.S. Iron Ore [Member]
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| Segment Reporting Information [Line Items] | |
| Number of mines (in number of facilities) | 5 |
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Eastern Canadian Iron Ore [Member]
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| Segment Reporting Information [Line Items] | |
| Number of mines (in number of facilities) | 2 |
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Asia Pacific Coal [Member] | Sonoma [Member]
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| Segment Reporting Information [Line Items] | |
| Ownership interest, percent | 45.00% |
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Latin American Iron Ore [Member] | Amapa [Member]
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| Segment Reporting Information [Line Items] | |
| Percent ownership interest | 30.00% |
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Metallurgical Coal Mines [Member] | North American Coal [Member]
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| Segment Reporting Information [Line Items] | |
| Number of mines (in number of facilities) | 5 |
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Thermal Coal Mines [Member] | North American Coal [Member]
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| Segment Reporting Information [Line Items] | |
| Number of mines (in number of facilities) | 1 |
| X | ||||||||||
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- Definition
Number of mines No definition available.
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee. No definition available.
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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