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Reclassifications out of Accumulated Other Comprehensive Income Loss (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Equity [Abstract]        
Amortization of service cost $ 1,328 $ 2,217 $ 4,784 $ 7,024
Total before tax 1,328 2,217 4,784 7,024
Provision for income taxes (632) (789) (1,877) (2,508)
Total net of tax 696 1,428 2,907 4,516
Reclassification adjustments 1,847 1,898 5,587 5,743
Total before tax 1,847 1,898 5,587 5,743
Provision for income taxes (673) (694) (2,036) (2,099)
Total net of tax $ 1,174 $ 1,204 $ 3,551 $ 3,644