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Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reconciliations of total equity        
Beginning Balance $ 1,215,097 $ 1,125,711 $ 1,166,065 $ 1,074,193
Issuance of common stock under incentive compensation plan 470 169 2,386 353
Purchase of common stock   (5,281)   (22,257)
Stock-based and deferred compensation 1,750 3,300 1,215 10,226
Net income 12,571 39,384 41,397 136,319
Other comprehensive income (loss) (18,955) (25,571) 16,187 (46,137)
Cash dividends paid:        
Common stock (8,162) (7,473) (24,479) (22,458)
Ending Balance 1,202,771 1,130,239 1,202,771 1,130,239
Common Stock [Member]        
Reconciliations of total equity        
Beginning Balance 26,978 26,825 26,841 26,761
Issuance of common stock under incentive compensation plan 11 3 44 5
Stock-based and deferred compensation   1 104 63
Cash dividends paid:        
Ending Balance 26,989 26,829 26,989 26,829
Additional Paid-in Capital [Member]        
Reconciliations of total equity        
Beginning Balance 242,215 229,510 237,202 220,820
Issuance of common stock under incentive compensation plan 459 166 2,342 348
Stock-based and deferred compensation 1,757 3,360 4,887 11,868
Cash dividends paid:        
Ending Balance 244,431 233,036 244,431 233,036
Common Treasury Stock [Member]        
Reconciliations of total equity        
Beginning Balance (184,365) (172,322) (180,596) (153,702)
Purchase of common stock   (5,281)   (22,257)
Stock-based and deferred compensation (7) (61) (3,776) (1,705)
Cash dividends paid:        
Ending Balance (184,372) (177,664) (184,372) (177,664)
Accumulated Other Comprehensive Income (Loss) [Member]        
Reconciliations of total equity        
Beginning Balance (132,370) (173,802) (167,512) (153,236)
Other comprehensive income (loss) (18,955) (25,571) 16,187 (46,137)
Cash dividends paid:        
Ending Balance (151,325) (199,373) (151,325) (199,373)
Retained Earnings [Member]        
Reconciliations of total equity        
Beginning Balance 1,262,639 1,215,500 1,250,130 1,133,550
Net income 12,571 39,384 41,397 136,319
Cash dividends paid:        
Common stock (8,162) (7,473) (24,479) (22,458)
Ending Balance $ 1,267,048 $ 1,247,411 $ 1,267,048 $ 1,247,411