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Amounts Recognized in Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Pension Plans, Defined Benefit
   
Schedule of Pension and Other Postretirment Benefits Recgonized in Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net actuarial loss $ 99,129 $ 45,462
Net prior service cost (2,780) (2,757)
Pretax AOCI 96,349 42,705
Less deferred taxes 25,972 10,703
Post tax AOCI 70,377 32,002
Other Postretirement Benefit Plans, Defined Benefit
   
Schedule of Pension and Other Postretirment Benefits Recgonized in Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net actuarial loss 4,569 3,232
Net prior service cost 0 0
Pretax AOCI 4,569 3,232
Less deferred taxes 1,764 1,248
Post tax AOCI $ 2,805 $ 1,984