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Subsequent Events - Additional Information (Detail)
1 Months Ended
Dec. 31, 2012
USD ($)
Feb. 20, 2013
Subsequent Event [Member]
Orko Silver Corporation [Member]
Feb. 20, 2013
Subsequent Event [Member]
Orko Silver Corporation [Member]
Election One [Member]
CAD
Feb. 20, 2013
Subsequent Event [Member]
Orko Silver Corporation [Member]
Election Two [Member]
USD ($)
Feb. 20, 2013
Subsequent Event [Member]
Orko Silver Corporation [Member]
Election Three [Member]
CAD
Jan. 29, 2013
7.875% Senior Notes due 2021 [Member]
Subsequent Event [Member]
USD ($)
Jan. 29, 2013
7.875% Senior Notes due 2021 [Member]
Subsequent Event [Member]
Minimum [Member]
Jan. 29, 2013
7.875% Senior Notes due 2021 [Member]
Subsequent Event [Member]
Maximum [Member]
Feb. 13, 2013
Convertible Senior Notes due March 2028 [Member]
Subsequent Event [Member]
USD ($)
Feb. 12, 2013
Convertible Senior Notes due March 2028 [Member]
Subsequent Event [Member]
USD ($)
Subsequent Event [Line Items]                    
Principal amount           $ 300,000,000        
Interest rate on notes           7.875%     3.25%  
Other indebtedness threshold for subsidiary guarantee           20,000,000        
Notice of redemption             30 days 60 days    
Redemption price, percentage of principal amount           100.00%     100.00%  
Percentage of principal amount               35.00%    
Redemption Price, percentage           107.875%        
Percentage of principal           101.00%        
Percentage of principal             25.00%      
Exchange offer period           365 days        
Issue period           35 days        
long-term debt 303,624,000 [1]                 48,658,000
Principal amount per conversion                 1,000  
Conversion Rate, number of shares per $1,000 of principal amount                 17.6025  
Conversion price per share (usd per share)                 $ 56.81  
Trading period used to determine conversion rate                 20 days  
Number of Coeur shares per share of Orko     0.08150 0.1118            
Cash payment per share (cad per share)     0.70   2.60          
Number of warrants per share     0.01118 0.011180 0.01118          
Cash payment pro-ration threshold       $ 11,600,000 100,000,000          
Warrant exercise period   4 years                
Warrant exercise price (usd per share)   30.00                
[1] Includes minimum gold production royalty obligation payments due to Franco-Nevada Corporation for royalty covering 50% of the life of mine gold to be produced from the Palmarejo silver and gold mine in Mexico.