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Share-Based Compensation - Summary of Nonvested Restricted Stock Activity and Related Information (Detail)
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Shares  
Non-vested restricted stock outstanding at June 30, 2021 (in shares) 500
Restricted Shares  
Shares  
Non-vested restricted stock outstanding at December 31, 2020 (in shares) 701
Granted (in shares) 153
Vested (in shares) (353)
Forfeited (in shares) (37)
Non-vested restricted stock outstanding at June 30, 2021 (in shares) 464
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 122.51
Vested (in usd per share) | $ / shares 68.29
Forfeited (in usd per share) | $ / shares 93.97
Non-vested restricted stock outstanding at June 30, 2021 (in usd per share) | $ / shares $ 97.07
Performance Restricted Stock Units  
Shares  
Non-vested restricted stock outstanding at December 31, 2020 (in shares) 264
Granted (in shares) 81
Performance assumption change (in shares) 39
Vested (in shares) (88)
Forfeited (in shares) (5)
Non-vested restricted stock outstanding at June 30, 2021 (in shares) 291
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
Performance assumption change (in usd per share) | $ / shares 78.20
Vested (in usd per share) | $ / shares 78.20
Forfeited (in usd per share) | $ / shares 91.58
Non-vested restricted stock outstanding at June 30, 2021 (in usd per share) | $ / shares $ 85.29