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Share-Based Compensation Plans - Summary of Stock Activity under SICP - Key employees (Detail) - $ / shares
6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of Shares, Granted 526 652 683
SICP Awards to Key Employees      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of Shares, Outstanding Beginning Balance   197,398 186,878
Number of Shares, Granted   69,620 69,903
Number of Shares, Vested   (60,850) (53,147)
Number of Shares, Outstanding Ending Balance 203,490 203,490 197,398
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted Average Grant Date Fair Value, Outstanding Beginning Balance   $ 94.15 $ 87.06
Weighted Average Grant Date Fair Value, Granted   117.61 100.76
Weighted Average Grant Date Fair Value, Vested   90.60 76.31
Weighted Average Grant Date Fair Value, Outstanding Ending Balance $ 103.06 103.06 $ 94.15
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period [1]     (5,384)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value [1]     $ 93.39
Accelerated Vested Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted Average Grant Date Fair Value, Vested   $ 91.42 $ 74.85
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number   2,678 852
[1] In conjunction with the retirement of one key employee during 2020, these shares were forfeited for the remainder of the service periods associated with awards granted during their employment with the Company.