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Summary of Restricted Stock Activity (Detail) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of shares      
Number of shares, Unvested, beginning of year 844 897 1,083
Number of shares, Granted 640 366 293
Assumed in CMC acquisition Restricted Stock Units 0 155 0
Number of shares, Vested (389) (523) (439)
Number of shares, Forfeited (90) (51) (40)
Number of shares, Unvested, end of year 1,005 844 897
Weighted average grant date fair value, Unvested      
Weighted average grant date fair value, Unvested, beginning of year $ 90.37 $ 62.69 $ 41.31
Weighted average grant date fair value, Granted 80.45 117.82 101.04
Weighted average grant date fair value, Restricted stock units assumed in acquisition. 0 92.96 0
Weighted average grant date fair value, Vested 78.17 64.77 35.58
Weighted average grant date fair value, Forfeited 89.23 85.16 57.39
Weighted average grant date fair value, Unvested, end of year $ 89.08 $ 90.37 $ 62.69