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Components of Amounts Recognized in Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]    
Amounts Recognized in Statement of Financial Position, Current liabilities $ (7,623) $ (6,284)
Amounts Recognized in Statement of Financial Position, Noncurrent liabilities (164,538) (148,686)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Total 81,999 74,076
Pension Plans
    
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]    
Development of Net Amount Recognized, Benefit obligation in excess of plan assets at December 31 (140,355) (129,033)
Amounts Recognized in Statement of Financial Position, Current liabilities (6,290) (5,232)
Amounts Recognized in Statement of Financial Position, Noncurrent liabilities (134,065) (123,801)
Amounts Recognized in Statement of Financial Position, Accrued benefit recognized at December 31 (140,355) (129,033)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Prior service cost 21,309 23,573
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Actuarial loss 54,951 45,791
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Total 76,260 69,364
Postretirement Plans
    
Schedule Of Accumulated Benefit Obligations In Excess Of Fair Value Of Plan Assets And Amounts Recognized In Balance Sheet And In Other Comprehensive Income Loss [Line Items]    
Development of Net Amount Recognized, Benefit obligation in excess of plan assets at December 31 (31,806) (25,937)
Amounts Recognized in Statement of Financial Position, Current liabilities (1,333) (1,052)
Amounts Recognized in Statement of Financial Position, Noncurrent liabilities (30,473) (24,885)
Amounts Recognized in Statement of Financial Position, Accrued benefit recognized at December 31 (31,806) (25,937)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Prior service cost (216) (481)
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Actuarial loss 5,955 5,193
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax, Total $ 5,739 $ 4,712