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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain on sales of securities $ 26,936 $ 13 $ 28,915 $ 176
Income tax (benefit) expense (65,447) (74,673) (125,644) (149,595)
Net income $ 115,255 $ 126,460 219,212 $ 256,369
Reclassifications, net of tax [1]     (1,324)  
Past service liability        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1],[2]     124  
Actuarial losses        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1],[2]     (4,242)  
Amortization of defined benefit pension        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Reclassifications, before tax [1]     (4,118)  
Tax benefit [1]     1,716  
Reclassifications, net of tax [1]     (2,402)  
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains on available for sale securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain on sales of securities [1]     1,848  
Income tax (benefit) expense [1]     (770)  
Net income [1]     $ 1,078  
[1] Amounts in parentheses indicate expense items.
[2] See Note 9, "Pension and Other Post-Retirement Benefits," for additional information.