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Reconciliations of Equity - Reconciliations of Total Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Reconciliations of total equity        
Beginning Balance $ 1,193,024 $ 1,200,538 $ 1,244,010 $ 1,169,934
Issuance of common stock under incentive compensation plan 0 22 294 104
Stock-based and deferred compensation 3,094 2,145 1,881 1,090
Net income (loss) 22,911 11,341 (18,495) 31,052
Other comprehensive income 1,996 36,369 2,298 56,919
Cash dividends paid:        
Common stock (8,979) (8,702) (17,942) (17,386)
Ending Balance 1,212,046 1,241,713 1,212,046 1,241,713
Common Stock [Member]        
Reconciliations of total equity        
Beginning Balance 27,447 27,253 27,301 27,156
Issuance of common stock under incentive compensation plan     7 2
Stock-based and deferred compensation 21 38 160 133
Cash dividends paid:        
Ending Balance 27,468 27,291 27,468 27,291
Additional Paid-in Capital [Member]        
Reconciliations of total equity        
Beginning Balance 262,200 254,366 259,820 253,779
Issuance of common stock under incentive compensation plan 0 22 287 102
Stock-based and deferred compensation 3,073 2,187 5,166 2,694
Cash dividends paid:        
Ending Balance 265,273 256,575 265,273 256,575
Common Treasury Stock [Member]        
Reconciliations of total equity        
Beginning Balance (193,334) (189,706) (189,889) (188,049)
Stock-based and deferred compensation   (80) (3,445) (1,737)
Cash dividends paid:        
Ending Balance (193,334) (189,786) (193,334) (189,786)
Accumulated Other Comprehensive Income (Loss) [Member]        
Reconciliations of total equity        
Beginning Balance (138,672) (176,288) (138,974) (196,838)
Other comprehensive income 1,996 36,369 2,298 56,919
Cash dividends paid:        
Ending Balance (136,676) (139,919) (136,676) (139,919)
Retained Earnings [Member]        
Reconciliations of total equity        
Beginning Balance 1,235,383 1,284,913 1,285,752 1,273,886
Net income (loss) 22,911 11,341 (18,495) 31,052
Cash dividends paid:        
Common stock (8,979) (8,702) (17,942) (17,386)
Ending Balance $ 1,249,315 $ 1,287,552 $ 1,249,315 $ 1,287,552