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Deferred Compensation - Additional Information (Detail) - USD ($)
shares in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Investments And Employee Deferred Compensation Plan [Line Items]              
Deferred Equity Participation Plan, distributions to key executives, age         age 62 (or the one-year anniversary of the date of the grant for participants over the age of 61 as of the grant date) or upon or after their actual retirement if later.    
Deferred Equity Participation Sub-plans, distributions requisite service description         we annually make awards under sub-plans of the DEPP for certain production staff, which generally provide for vesting and/or distributions no sooner than five years from the date of awards, although certain awards vest and/or distribute after the earlier of fifteen years or the participant reaching age 65.    
Deferred Equity Participation Sub-plans, distributions to key executives, age         age 65    
Deferred Equity Participation Plan (DEPP) [Member]              
Investments And Employee Deferred Compensation Plan [Line Items]              
Awards approved by committee, value   $ 17,000,000.0   $ 14,100,000      
Charge to compensation expenses related to awards $ 3,800,000   $ 3,000,000.0   $ 10,300,000 $ 9,000,000.0  
Unearned deferred compensation, value         $ 74,300,000   $ 60,500,000
Unearned deferred compensation, shares         2.7   2.6
Total intrinsic value of unvested equity based awards         $ 402,800,000   $ 327,800,000
Cash and equity awards with aggregate fair value vested and distributed to participants         10,100,000 9,800,000  
Deferred Equity Participation Plan Sub Plans [Member]              
Investments And Employee Deferred Compensation Plan [Line Items]              
Awards approved by committee, value   3,200,000   1,800,000      
Charge to compensation expenses related to awards 500,000   700,000   1,900,000 2,100,000  
Distributions from the sub-plans         0 0  
Deferred Cash Participation Plan (DCPP) [Member]              
Investments And Employee Deferred Compensation Plan [Line Items]              
Awards approved by committee, value   $ 7,200,000   $ 3,000,000.0      
Charge to compensation expenses related to awards $ 2,900,000   $ 1,600,000   7,000,000.0 5,000,000.0  
Cash and equity awards with aggregate fair value vested and distributed to participants         $ 6,700,000 $ 7,300,000