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Employee Benefit Plans and Other Postretirement Plans - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Decrease in the benefit obligation $ 13,800,000  
Decrease in accumulated other comprehensive income (loss) 8,455,000 8,455,000
Deferred taxes 5,400,000  
Pension Plans
   
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Pre-tax pension curtailment charge 7,776,000 7,776,000
Expected company contributions   $ 30,100,000