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Restricted Stock, Performance Share and Cash Awards - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Mar. 16, 2021
USD ($)
shares
Mar. 12, 2020
USD ($)
shares
Sep. 30, 2021
USD ($)
shares
Mar. 31, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
shares
Sep. 30, 2021
USD ($)
TIME
shares
Sep. 30, 2020
USD ($)
shares
Dec. 31, 2020
shares
Mar. 14, 2019
USD ($)
shares
Mar. 15, 2018
USD ($)
shares
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                        
Share-based compensation, shares outstanding | shares     7,900,000         7,900,000   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     $ 6,700,000   $ 5,500,000     $ 20,200,000 $ 17,000,000.0      
Unvested Restricted Stock [Member]                        
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                        
Total intrinsic value     293,400,000   221,100,000     293,400,000 221,100,000      
Equity awards with an aggregate fair value     500,000         48,600,000 30,600,000      
Performance Shares [Member]                        
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                        
Restricted stock or unit expense     3,100,000   3,100,000     9,300,000 11,600,000      
Total intrinsic value     48,300,000   35,400,000     48,300,000 35,400,000      
Equity awards with an aggregate fair value               $ 19,100,000 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).        
2019 Provisional Cash Awards [Member]                        
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                        
Cash-based compensation awards, expenses     2,800,000   2,900,000     $ 8,800,000 7,200,000      
Performance awards expiration date               Jan. 01, 2022        
2020 Provisional Cash Awards [Member]                        
Common Stock Options Restricted Stock Warrants And Changes In Capitalization [Line Items]                        
Cash-based compensation awards, expenses     $ 3,200,000         $ 9,400,000        
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         176,300        
Cash-based compensation awards, expenses         $ 2,700,000     $ 17,700,000 $ 6,800,000      
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       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                 $ 16,500,000 $ 15,000,000.0
Provisional compensation cash award approved for future grant by compensation committee, units | shares 147,000 213,000   208,000   200,000 190,000       206,800 219,000
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         $ 4,000,000.0        
Share-based compensation, shares outstanding | shares     1,800,000         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