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Asset Allocation Ranges and Actual Allocation, CRIP (Detail)

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Asset Allocation Ranges and Actual Allocation, CRIP (Detail) (Canadian Retirement Income Plan, or CRIP)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Canadian Equities
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 25.00%  
Range maximum 50.00%  
Actual 35.60% 34.80%
U.S. Equities
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 19.00%  
Actual 0.00% 5.20%
International Equities
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 19.00%  
Actual 14.10% 8.90%
Fixed Income
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 30.00%  
Range maximum 70.00%  
Actual 49.90% 50.50%
Money Market
   
Defined Benefit Plan Disclosure [Line Items]    
Range minimum 0.00%  
Range maximum 10.00%  
Actual 0.40% 0.60%