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Receivables (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Prepayments | $ 138.9 | [1] | $ 198.0 | [1]
Far Southeast (FSE) Deposit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Prepayments | 0 |  | 120.0 |
Mankayan Project-Bezant Resources |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Prepayments | $ 7.0 |  | $ 7.0 |
[1] | Includes $7.0 million for the Bezant's Mankayan Project (December 31, 2011: $120.0 million for the FSE project and $7.0 for Bezant).

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