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Share-Based Compensation - Summary of Nonvested Restricted Stock Activity and Related Information (Detail)
shares in Thousands
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Shares  
Performance assumption change (in shares) 39
Non-vested restricted stock outstanding at March 31, 2021 (in shares) 600
Weighted Average  Grant Date Fair Value  
Performance assumption change (in usd per share) | $ / shares $ 78.20
Restricted Shares  
Shares  
Non-vested restricted stock outstanding at December 31, 2020 (in shares) 701
Granted (in shares) 146
Vested (in shares) (209)
Forfeited (in shares) (5)
Non-vested restricted stock outstanding at March 31, 2021 (in shares) 633
Weighted Average  Grant Date Fair Value  
Non-vested restricted stock outstanding at December 31, 2020 (in usd per share) | $ / shares $ 76.86
Granted (in usd per share) | $ / shares 121.91
Vested (in usd per share) | $ / shares 61.57
Forfeited (in usd per share) | $ / shares 84.46
Non-vested restricted stock outstanding at March 31, 2021 (in usd per share) | $ / shares $ 92.25
Performance Restricted Stock Units  
Shares  
Non-vested restricted stock outstanding at December 31, 2020 (in shares) 264
Granted (in shares) 81
Vested (in shares) (88)
Forfeited (in shares) (1)
Non-vested restricted stock outstanding at March 31, 2021 (in shares) 295
Weighted Average  Grant Date Fair Value  
Non-vested restricted stock outstanding at December 31, 2020 (in usd per share) | $ / shares $ 72.90
Granted (in usd per share) | $ / shares 121.91
Vested (in usd per share) | $ / shares 78.20
Forfeited (in usd per share) | $ / shares 67.43
Non-vested restricted stock outstanding at March 31, 2021 (in usd per share) | $ / shares $ 85.43