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Pensions and Other Employee Benefits - Weighted Average Assumptions Used to Determine Benefit Obligations (Detail)
Dec. 31, 2013
Dec. 31, 2012
Pension Plans [Member]
   
Benefit obligations:    
Discount rate 5.03% 4.15%
Rate of compensation increase 3.50% 3.56%
Postretirement Benefit Plans [Member]
   
Benefit obligations:    
Discount rate 4.43% 3.37%
Rate of compensation increase 3.50% 3.59%