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Summary of Restricted Stock Activity (Detail) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Number of shares      
Number of shares, Unvested, beginning of year 1,005 844 897
Number of shares, Granted 484 640 366
Assumed in CMC acquisition Restricted Stock Units 0 0 155
Number of shares, Vested (371) (389) (523)
Number of shares, Forfeited (61) (90) (51)
Number of shares, Unvested, end of year 1,057 1,005 844
Weighted average grant date fair value, Unvested      
Weighted average grant date fair value, Unvested, beginning of year $ 89.08 $ 90.37 $ 62.69
Weighted average grant date fair value, Granted 138.44 80.45 117.82
Weighted average grant date fair value, Restricted stock units assumed in acquisition. 0 0 92.96
Weighted average grant date fair value, Vested 86.92 78.17 64.77
Weighted average grant date fair value, Forfeited 101.31 89.23 85.16
Weighted average grant date fair value, Unvested, end of year $ 111.81 $ 89.08 $ 90.37