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Stock Compensation Plans - RSU, PRS and Cash RSU Activity (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2021
$ / shares
shares
RSU's [Member]  
Number of Shares  
Beginning balance (in shares) | shares 525
Granted (in shares) | shares 344
Vested (in shares) | shares (314)
Forfeited (in shares) | shares (37)
Assumed (in shares) | shares 259
Ending balance (in shares) | shares 777
Weighted Average Grant Date Fair Value Per Share  
Beginning balance (in dollars per share) | $ / shares $ 126.62
Granted (in dollars per share) | $ / shares 136.71
Vested (in dollars per share) | $ / shares 119.99
Forfeited (in dollars per share) | $ / shares 128.79
Assumed (in dollars per share) | $ / shares
Ending balance (in dollars per share) | $ / shares $ 126.20
Restricted Stock [Member]  
Number of Shares  
Beginning balance (in shares) | shares 193
Granted (in shares) | shares 62
Vested (in shares) | shares (95)
Forfeited (in shares) | shares (5)
Ending balance (in shares) | shares 155
Weighted Average Grant Date Fair Value Per Share  
Beginning balance (in dollars per share) | $ / shares $ 136.37
Granted (in dollars per share) | $ / shares 144.67
Vested (in dollars per share) | $ / shares 138.41
Forfeited (in dollars per share) | $ / shares 141.81
Ending balance (in dollars per share) | $ / shares $ 138.36
Cash RSU's [Member]  
Number of Shares  
Beginning balance (in shares) | shares 111
Granted (in shares) | shares 51
Vested (in shares) | shares (37)
Forfeited (in shares) | shares (9)
Ending balance (in shares) | shares 116
Weighted Average Grant Date Fair Value Per Share  
Beginning balance (in dollars per share) | $ / shares $ 108.84
Granted (in dollars per share) | $ / shares 150.65
Vested (in dollars per share) | $ / shares 141.58
Forfeited (in dollars per share) | $ / shares 140.43
Ending balance (in dollars per share) | $ / shares $ 150.65