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Fair Values of Pension Plan Assets (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Maximum percentage of net assets invested in emerging market 30.00%  
Equity Hedge Based Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested in funds 22.00% 20.00%
Tactical/Directional Based Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested in funds 30.00% 27.00%
Relative Value Based Funds
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested in funds 25.00% 29.00%
Event Driven Strategy
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested in funds 17.00% 17.00%
Cash
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested in funds 6.00% 7.00%
Foreign Companies
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested in foreign equity securities 80.00%  
High Yield Fixed Income
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested 80.00%  
Fixed Income Securities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested 80.00%  
U.S. Russell 2500 Index | Large Companies
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested 80.00%  
U.S. Russell 2500 Index | Small And Mid-Sized Companies | Equity Securities
    
Schedule of Pension Plan Assets by Fair Value [Line Items]    
Percentage of net assets invested 80.00%