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Share-Based Compensation - Summary of Nonvested Restricted Stock Activity and Related Information (Detail)
shares in Thousands
6 Months Ended
Jun. 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) 148
Vested (in shares) (347)
Forfeited (in shares) (21)
Non-vested restricted stock outstanding at June 30, 2021 (in shares) 481
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 122.01
Vested (in usd per share) | $ / shares 68.06
Forfeited (in usd per share) | $ / shares 91.66
Non-vested restricted stock outstanding at June 30, 2021 (in usd per share) | $ / shares $ 96.42
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) (4)
Non-vested restricted stock outstanding at June 30, 2021 (in shares) 292
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 81.76
Non-vested restricted stock outstanding at June 30, 2021 (in usd per share) | $ / shares $ 85.44