Basis Of Presentation And Significant Accounting Policies (Narrative) (Detail)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | |||||||
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Sep. 30, 2011
Renewafuel [Member]
USD ($)
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Sep. 30, 2012
Renewafuel [Member]
USD ($)
|
Sep. 30, 2011
Renewafuel [Member]
USD ($)
|
Sep. 30, 2011
Arcelor Mittal [Member]
USD ($)
|
Sep. 30, 2011
Arcelor Mittal [Member]
USD ($)
|
Sep. 30, 2011
Empire [Member]
USD ($)
|
Sep. 30, 2011
Empire [Member]
USD ($)
|
Sep. 30, 2012
Empire [Member]
|
Sep. 30, 2011
Empire [Member]
|
Sep. 30, 2012
Black Label And Black Thor Chromite Deposits [Member]
|
Sep. 30, 2012
Big Daddy Chromite Deposit [Member]
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Sep. 30, 2012
Asia Pacific Iron Ore [Member]
Cockatoo [Member]
USD ($)
|
Sep. 30, 2012
Asia Pacific Iron Ore [Member]
Cockatoo [Member]
AUD
|
Sep. 30, 2012
Asia Pacific Coal [Member]
Sonoma [Member]
AUD
|
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Related Party Transaction [Line Items] | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Asset Impairment Charges | $ 16,700,000 | 听 | $ 16,700,000 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Error Correction to Retained earnings | 听 | 听 | 听 | 听 | 听 | 0 | 0 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Ownership interest, percent | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 79.00% | 79.00% | 100.00% | 70.00% | 听 | 听 | 45.00% |
Proceeds from Divestiture of Interest in Joint Venture | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 4.00 | 141,000,000 |
Error Correction to income (loss) from continuing operations including portion attributable to noncontrolling interest | 听 | 听 | 听 | 听 | 听 | 16,100,000 | 16,100,000 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Error Correction to net income (loss) | 听 | 听 | 听 | 听 | 听 | 67,900,000 | 67,900,000 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Noncontrolling interest | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 21.00% | 听 | 听 | 听 | 听 | 听 |
Error Correction to Net Income (Loss) Attributable to Noncontrolling Interest | 听 | 听 | 听 | 听 | 听 | 84,000,000 | 84,000,000 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Error Correction to Earnings Per Share, Basic | 听 | 听 | 听 | 听 | 听 | 0.47 | 0.49 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Error Correction To Earnings Per Share, Diluted | 听 | 听 | 听 | 听 | 听 | 0.47 | 0.48 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Income (loss) from discontinued operations | 17,500,000 | 100,000 | 18,700,000 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Error Correction to Stockholders' Equity Attributable to Noncontrolling Interest | 听 | 听 | 听 | 听 | 听 | 84,000,000 | 84,000,000 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Error correction to Sales revenue, net | 听 | 听 | 听 | 54,100,000 | 54,100,000 | 46,000,000 | 46,000,000 | 听 | 听 | 听 | 听 | 听 | 听 | 听 |
Estimated Rehabilitation Costs | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | 听 | $ 24,000,000 | 听 | 听 |