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Restricted Stock, Performance Share and Cash Awards - Additional Information (Detail)
 3 Months Ended
Mar. 16, 2021
USD ($)
shares
Mar. 12, 2020
USD ($)
shares
Mar. 31, 2021
USD ($)
TIME
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
shares
Dec. 31, 2020
shares
Mar. 15, 2018
USD ($)
shares
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Share-based compensation, shares outstanding | shares     8,400,000     7,500,000  
Restricted Stock Units (RSUs) [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Shares granted in the period | shares     314,000 405,900      
Fair value of grants in period     $ 40,100,000 $ 34,900,000      
Share based payment award vesting date     Mar. 16, 2026 Mar. 12, 2025      
Period of service from grant date stock options awarded not subject to forfeiture     2 years 2 years      
Restricted stock or unit expense     $ 5,900,000 $ 4,900,000      
Unvested Restricted Stock [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Total intrinsic value     212,800,000 135,000,000.0      
Equity awards with an aggregate fair value     46,700,000 29,800,000      
Performance Shares [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Restricted stock or unit expense     3,000,000.0 6,100,000      
Total intrinsic value     36,300,000 23,900,000      
Equity awards with an aggregate fair value     $ 19,500,000 12,500,000      
Shares authorized | shares 67,000 82,500          
Performance share awards approved, Fair value $ 8,600,000 $ 7,100,000          
Vesting period, years     2 years        
2017 Performance Share Awards [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Provisional awards, terms     The 2021 and 2020 awards are subject to a three-year performance period that began on January 1, 2021 and 2020, respectively, and vest on the three-year anniversary of the date of grant (March 16, 2024 and March 12, 2023).        
2020 Provisional Cash Awards [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Cash-based compensation awards, expenses     $ 2,900,000        
Performance awards expiration date     Jan. 01, 2023        
2018 Provisional Cash Awards [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Provisional compensation cash award approved for future grant by compensation committee, units | shares     176,300        
Cash-based compensation awards, expenses     $ 17,700,000 $ 2,600,000      
Performance awards expiration date         Jan. 01, 2021    
2017 Provisional Cash Awards [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Provisional compensation cash award approved for future grant by compensation committee, units | shares       221,600      
Cash-based compensation awards, expenses       $ 18,900,000      
Executive Officer [Member] | Restricted Stock Units (RSUs) [Member] | Minimum [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Minimum age of employee with not subject to award forfeiture on condition compliance     55 years 55 years      
Officer and Key Employees [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Performance awards period, years 1 year            
Officer and Key Employees [Member] | Cash Awards [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Provisional awards, terms     The ultimate award value will be equal to the trailing twelve-month price of our common stock on December 31, 2023, multiplied by the number of units subject to the award, but limited to between 0.5 and 1.5 times the original value of the units determined as of the grant date.        
Vesting period, years 3 years            
Provisional compensation cash awards approved for future grant by compensation committee, value $ 18,800,000 $ 18,400,000         $ 15,000,000.0
Provisional compensation cash award approved for future grant by compensation committee, units | shares 147,000 213,000   208,000 190,000   219,000
Ultimate award value, multiples of original value of the units, minimum | TIME     0.5        
Ultimate award value, multiples of original value of the units, maximum | TIME     1.5        
Cash-based compensation awards, expenses     $ 0        
Long Term Incentive Plan [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Share-based compensation, shares outstanding, Value     $ 4,000,000.0        
Share-based compensation, shares outstanding | shares     1,800,000        
Shares granted in the period | shares     1,800,000        
Long Term Incentive Plan [Member] | Minimum [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Period of service from grant date stock options awarded not subject to forfeiture     2 years 2 years      
Long Term Incentive Plan [Member] | Executive Officer [Member] | Minimum [Member]              
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]              
Minimum age of employee with not subject to award forfeiture on condition compliance     55 years 55 years