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Share-based Compensation (Summary of Restricted Stock Activity) (Detail) - Restricted Stock [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Shares    
Outstanding at beginning of period 46 57
Granted 43 29
Vested (32) (37)
Forfeited (7) (3)
Outstanding at end of period 50 46
Weighted-Average Grant Date Fair Value    
Outstanding at beginning of period $ 98.28 $ 50.55
Granted 113.87 130.89
Vested 88.71 45.83
Forfeited 108.86 167.48
Outstanding at end of period $ 116.06 $ 98.28