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Reclassifications of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income tax (expense) benefit $ 34,738   $ 33,145   $ 49,653 $ 64,133
Net income 105,347 $ 100,328 97,246 $ 97,577 205,675 194,823
Interest expense $ 157,203   $ 216,062   353,778 $ 420,911
Reclassifications, net of tax [1]         (2,643)  
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]         (3,674)  
Amortization of defined benefit pension            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Reclassifications, before tax [1]         (3,550)  
Tax benefit [1]         976  
Reclassifications, net of tax [1]         (2,574)  
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]         734  
Income tax (expense) benefit [1]         (202)  
Net income [1]         532  
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized loss on cash flow hedges            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income tax (expense) benefit [1]         227  
Net income [1]         (601)  
Interest expense [1]         $ (828)  
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.