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Pensions and Other Employee Benefits - Allowable Range for Each Major Category of Plans' Assets and Weighted-Average Asset Allocations by Asset Category (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
U.S. [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Weighted-average asset allocations 100.00% 100.00%
U.S. [Member] | Domestic Equity [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 30.00% 30.00%
Percentage of plan assets, maximum range 60.00% 60.00%
Weighted-average asset allocations 54.00% 51.00%
U.S. [Member] | International Equity [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 10.00% 10.00%
Percentage of plan assets, maximum range 20.00% 20.00%
Weighted-average asset allocations 11.00% 10.00%
U.S. [Member] | Fixed Income Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 20.00% 20.00%
Percentage of plan assets, maximum range 40.00% 40.00%
Weighted-average asset allocations 22.00% 29.00%
U.S. [Member] | Real Estate Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 0.00% 0.00%
Percentage of plan assets, maximum range 15.00% 15.00%
Weighted-average asset allocations 6.00% 8.00%
U.S. [Member] | Other Asset [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 0.00% 0.00%
Percentage of plan assets, maximum range 15.00% 15.00%
Weighted-average asset allocations 7.00% 2.00%
Canada [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Weighted-average asset allocations 100.00% 100.00%
Canada [Member] | Domestic Equity [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 10.00% 15.00%
Percentage of plan assets, maximum range 25.00% 30.00%
Weighted-average asset allocations 20.00% 19.00%
Canada [Member] | International Equity [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 30.00% 20.00%
Percentage of plan assets, maximum range 60.00% 50.00%
Weighted-average asset allocations 49.00% 46.00%
Canada [Member] | Fixed Income Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 20.00% 25.00%
Percentage of plan assets, maximum range 60.00% 55.00%
Weighted-average asset allocations 28.00% 32.00%
Canada [Member] | Real Estate Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range      
Percentage of plan assets, maximum range      
Weighted-average asset allocations      
Canada [Member] | Other Asset [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets, minimum range 0.00% 0.00%
Percentage of plan assets, maximum range 15.00% 15.00%
Weighted-average asset allocations 3.00% 3.00%