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Share-based Compensation (Summary of Restricted Stock Activity) (Detail) - Restricted Stock - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Shares    
Outstanding at beginning of period 50 46
Granted 22 43
Vested (26) (32)
Forfeited (3) (7)
Outstanding at end of the period 43 50
Weighted-Average Grant Date Fair Value    
Outstanding at beginning of period $ 116.06 $ 98.28
Granted 264.58 113.87
Vested 116.68 88.71
Forfeited 169.47 108.86
Outstanding at end of the period $ 183.51 $ 116.06