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Property Plant and Equipment - Additional Information (Detail)
In Millions, unless otherwise specified
 1 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended
Aug. 27, 2009
USD ($)
Aug. 27, 2009
AUD
Dec. 31, 2010
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2010
USD ($)
Jun. 30, 2009
USD ($)
Dec. 31, 2011
$60 million senior secured revolving credit facility
USD ($)
Dec. 22, 2010
$60 million senior secured revolving credit facility
USD ($)
Jun. 30, 2010
Glencar Mining Plc
Jun. 30, 2009
St Ives
Jun. 30, 2009
St Ives
Minimum
Ounce
Property, Plant and Equipment [Line Items]                      
Depreciation of property, plant and equipment     $ 389.4 $ 745.3 $ 631.1 $ 433.5          
Fleet assets pledged       80.7              
Revolving credit facility, maximum borrowing capacity             60.0 60.0      
Royalty termination 257.1 308.0     257.1            
Royalty termination agreement                   The terminated royalty agreement required St. Ives to pay a 4% net smelter volume royalty on all of its revenues once total gold produced from November 30, 2001 exceeded 3.3 million ounces which was triggered early in fiscal year ended June 30, 2009, and provided that if the gold price exceeded A$600 per ounce, to pay an additional 10% of the revenue difference between the spot gold price, in Australian dollars per ounce, and the price of A$600 per ounce.  
Net smelter volume royalty payment on all revenues                   4.00%  
Gold production volume required to trigger royalty, minimum                     3,300,000
Gold threshold price in Australian dollars per ounce for additional royalty payment                   600  
Additional royalty percentage payable                   10.00%  
Ownership acquired, percentage                 100.00%    
Ownership acquired, amount         $ 43.0