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Deferred Compensation - Additional information (Detail) - USD ($)
shares in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
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.    
Deferred Equity Participation Sub-plans, distributions to key executives, age Age 65    
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 Plan (DEPP) [Member]      
Investments And Employee Deferred Compensation Plan [Line Items]      
Awards approved by committee, value $ 10,100,000 $ 11,500,000  
Charge to compensation expenses related to awards 2,000,000 1,900,000  
Cash and equity awards with aggregate fair value vested and distributed to participants 0    
Unearned deferred compensation, value $ 69,000,000   $ 57,600,000
Unearned deferred compensation, shares 2.9   2.7
Total intrinsic value of unvested equity based awards $ 224,000,000   $ 199,800,000
Deferred Cash Participation Plan (DCPP) [Member]      
Investments And Employee Deferred Compensation Plan [Line Items]      
Awards approved by committee, value 2,400,000 5,600,000  
Charge to compensation expenses related to awards 1,100,000 800,000  
Cash and equity awards with aggregate fair value vested and distributed to participants 800,000    
Deferred Equity Participation Plan Sub Plans [Member]      
Investments And Employee Deferred Compensation Plan [Line Items]      
Awards approved by committee, value 2,600,000 900,000  
Charge to compensation expenses related to awards 500,000 $ 500,000  
Cash and equity awards with aggregate fair value vested and distributed to participants $ 0