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Comprehensive Income - Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Cash flow hedge:                      
Income before income taxes                 $ 583,400 $ 464,579 $ 463,805
Related income tax effect $ (31,068) $ (33,735) $ (31,367) $ (22,627) $ (26,651) $ (24,649) $ (18,878) $ (21,405) (118,797) (91,583) (97,492)
Net income (loss) 128,828 [1] 130,748 [1] 120,721 [1] 84,306 [1] 94,408 [1] 95,267 [1] 96,507 [1] 86,814 [1] 464,603 372,996 366,313
Pension plan:                      
Net actuarial loss                 7,089 12,348 2,635
Amortization of net actuarial loss                 69 2,315 3,347
Income before income taxes                 583,400 464,579 463,805
Related income tax effect (31,068) (33,735) (31,367) (22,627) (26,651) (24,649) (18,878) (21,405) (118,797) (91,583) (97,492)
Net income (loss) $ 128,828 [1] $ 130,748 [1] $ 120,721 [1] $ 84,306 [1] $ 94,408 [1] $ 95,267 [1] $ 96,507 [1] $ 86,814 [1] 464,603 $ 372,996 $ 366,313
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Cash flow hedge:                      
Net income (loss)                 (1,948)    
Pension plan:                      
Net income (loss)                 (1,948)    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain Loss Net Cash Flow Hedge Parent [Member]                      
Cash flow hedge:                      
Net reclassification adjustment for losses                 (9,718)    
Income before income taxes                 (9,718)    
Related income tax effect                 2,323    
Net income (loss)                 (7,395)    
Pension plan:                      
Income before income taxes                 (9,718)    
Related income tax effect                 2,323    
Net income (loss)                 (7,395)    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]                      
Cash flow hedge:                      
Income before income taxes                 7,158    
Related income tax effect                 (1,711)    
Net income (loss)                 5,447    
Pension plan:                      
Net actuarial loss [2]                 7,089    
Amortization of net actuarial loss [3]                 69    
Income before income taxes                 7,158    
Related income tax effect                 (1,711)    
Net income (loss)                 $ 5,447    
[1] For further information, see the related discussion “Quarterly Results” included in Management’s Discussion and Analysis.
[2] This AOCI component is included in the computation of changes in plan assets (see Note O, Employee Benefit Plans)
[3] This AOCI component is included in the computation of net periodic pension cost (see Note O, Employee Benefit Plans)