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Quarterly report pursuant to Section 13 or 15(d)

Basis Of Presentation And Significant Accounting Policies (Narrative) (Detail)

v2.4.0.6
Basis Of Presentation And Significant Accounting Policies (Narrative) (Detail)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2011
Renewafuel [Member]
USD ($)
Sep. 30, 2012
Renewafuel [Member]
USD ($)
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 ($)
Sep. 30, 2012
Empire [Member]
Sep. 30, 2011
Empire [Member]
Sep. 30, 2012
Black Label And Black Thor Chromite Deposits [Member]
Sep. 30, 2012
Big Daddy Chromite Deposit [Member]
Sep. 30, 2012
Asia Pacific Iron Ore [Member]
Cockatoo [Member]
USD ($)
Sep. 30, 2012
Asia Pacific Iron Ore [Member]
Cockatoo [Member]
AUD
Sep. 30, 2012
Asia Pacific Coal [Member]
Sonoma [Member]
AUD
Related Party Transaction [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Asset Impairment Charges $ 16,700,000 Ìý $ 16,700,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error Correction to Retained earnings Ìý Ìý Ìý Ìý Ìý 0 0 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Ownership interest, percent Ìý Ìý Ìý Ìý Ìý Ìý Ìý 79.00% 79.00% 100.00% 70.00% Ìý Ìý 45.00%
Proceeds from Divestiture of Interest in Joint Venture Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 4.00 141,000,000
Error Correction to income (loss) from continuing operations including portion attributable to noncontrolling interest Ìý Ìý Ìý Ìý Ìý 16,100,000 16,100,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error Correction to net income (loss) Ìý Ìý Ìý Ìý Ìý 67,900,000 67,900,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Noncontrolling interest Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý 21.00% Ìý Ìý Ìý Ìý Ìý
Error Correction to Net Income (Loss) Attributable to Noncontrolling Interest Ìý Ìý Ìý Ìý Ìý 84,000,000 84,000,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error Correction to Earnings Per Share, Basic Ìý Ìý Ìý Ìý Ìý 0.47 0.49 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error Correction To Earnings Per Share, Diluted Ìý Ìý Ìý Ìý Ìý 0.47 0.48 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Income (loss) from discontinued operations 17,500,000 100,000 18,700,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error Correction to Stockholders' Equity Attributable to Noncontrolling Interest Ìý Ìý Ìý Ìý Ìý 84,000,000 84,000,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Error correction to Sales revenue, net Ìý Ìý Ìý 54,100,000 54,100,000 46,000,000 46,000,000 Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Estimated Rehabilitation Costs Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý Ìý $ 24,000,000 Ìý Ìý