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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on securities $ (466) $ 1,979
Income tax expense (37,925) (60,197)
Net (Loss) income 106,552 $ 103,957
Reclassifications, net of tax [1] (1,277)  
Past service liability    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] 62  
Actuarial losses    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1],[2] (1,871)  
Amortization of defined benefit pension    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Reclassifications, before tax [1] (1,809)  
Tax benefit [1] 532  
Reclassifications, net of tax [1] (1,277)  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available for sale securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net gain on securities [1] 0  
Income tax expense [1] 0  
Net (Loss) income [1] $ 0  
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, "Pension and Other Post-Retirement Benefits," for additional information.