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Receivables (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Prepayments $ 68.2 [1] $ 138.9 [1]
Mankayan Project-Bezant Resources
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Prepayments   $ 7.0
[1] In 2012, prepayments included $7.0 milllion for the Bezant's Mankayan Project.