Quarterly report pursuant to Section 13 or 15(d)

Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail)

v3.22.2
Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted stock units that vested during the period 470,000  
Fair value of restricted stock units that vested during the period $ 7.8 $ 2.5
Compensation expense recognized during the period 8.5 9.0
Income tax benefit (cost) related to restricted stock $ 1.1 $ 0.1
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of restricted stock units that vested during the period 100,000 10,000.00
Fair value of restricted stock units that vested during the period $ 1.7 $ 0.3
Accumulated dividends paid upon vesting of restricted stock units 0.3 0.1
Compensation expense recognized during the period 2.6 1.6
Income tax benefit (cost) related to restricted stock $ 0.1 $ (0.3)