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Option Intrinsic Values (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-Based Payment Arrangement [Abstract]        
Outstanding 750,000 [1] 200,000 846,667 693,333
Exercisable 400,000      
Exercised 0 [2] 0 0  
Weighted average exercise price per share $ 28.07 [1] $ 20.77 $ 30.54 $ 33.23
Exercisable 26.39      
Exercised $ 0 [2] $ 0 $ 0  
Outstanding $ 5.9      
Exercisable 3.8      
Exercised [2] $ 0.0      
[1] Of the options outstanding, 350,000 time-based stock options were granted with a weighted average exercise price per share of $30.00. These options will vest one-third on each of March 6, 2025, March 6, 2026, and March 6, 2027. The remaining 400,000 time-based options represent stock options granted to the Company's Chief Executive Officer. See note below under Chief Executive Officer for additional information.
[2] The intrinsic value of the exercised options is the difference between the fair market value at time of exercise and the strike price of the option.