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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain on sales of securities $ 4,054 $ 14,029 $ 21,036
Income tax (benefit) expense 84,857 (287,669) (271,579)
Net (Loss) income (47,156) $ 485,397 $ 475,547
Reclassifications, net of tax [1] 4,450    
Past-service cost      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1],[2] 249    
Actuarial losses      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1],[2] (8,591)    
Amortization of defined benefit pension      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications, before tax [1] (8,342)    
Tax benefit [1] 3,458    
Reclassifications, net of tax [1] (4,884)    
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 sales of securities [1] 740    
Income tax (benefit) expense [1] (306)    
Net (Loss) income [1] $ 434    
[1] Amounts in parentheses indicate expense items.
[2] Please see Note 12, "Employee Benefits," for additional information.