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Employee Benefit Plans and Other Postretirement Plans - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Decrease in the benefit obligation $ 8,100,000 $ 13,800,000  
Decrease in accumulated other comprehensive income (loss) 4,963,000 8,400,000 13,418,000
Deferred taxes 3,100,000 5,400,000  
Pension Plans
     
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pre-tax pension curtailment charge 3,132,000 7,800,000 10,908,000
Expected company contributions     $ 30,000,000