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Capital Stock - Schedule of Change in Treasury Shares (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Stockholders Equity Note [Abstract]    
Beginning balance 10,005,504 10,005,795
Rabbi trust shares distributed/sold (2,858) (3,149)
Shares repurchased 0 0
Ending balance 10,002,646 10,002,646