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Capital Stock - Schedule of Change in Treasury Shares (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Stockholders' Equity Note [Abstract]    
Beginning balance 30,045,000 26,766,065
Rabbi Trust shares distributed/sold 0 (1,065)
Shares repurchased 1,580,711 4,860,711
Ending balance 31,625,711 31,625,711