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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
compensation_plan
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense | $ $ 75,701 $ 44,562 $ 43,598
Tax benefit related to equity-based compensation costs | $ $ 17,200 $ 17,100 $ 17,000
Options exercised (in shares) 188,000 165,000 83,000
Combined plan contribution | $ $ 19,500 $ 18,400 $ 16,700
Shares contributed to the Employee Stock Ownership Plan (in Shares) 7,000 6,000  
Number of deferred compensation plans | compensation_plan 2    
Common stock, shares held in rabbi trust, shares (in shares) 107,340 108,640  
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options issued under the plan (in Shares) 16,000    
Total unrecognized compensation cost for all outstanding Options and RSUs | $ $ 302,000    
Weighted-average period over which the unrecognized compensation will be recorded 2 years 7 months 24 days    
RSUs | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 2 years    
Percentage of options vesting rights 50.00%    
RSUs | Options Granted in Current Year | Share-based Compensation Award, Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting rights over two years in 50% increments on December 31, 2022 and 2023    
Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of years for options granted 10 years    
Options issued under the plan (in Shares) 345,000    
Options | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 4 years    
Percentage of options vesting rights 25.00%    
Options | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 2 years    
Percentage of options vesting rights 50.00%    
Options | Share-based Compensation Award, Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options vesting rights 50.00%    
Options | Options Granted in Current Year | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting rights over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023    
Options | Options Granted in Current Year | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting rights over two years in 50% increments on December 31, 2020 and 2021    
Employee Performance Based Stock Option [Member] | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 4 years    
Percentage of options vesting rights 25.00%    
Employee Performance Based Stock Option [Member] | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 2 years    
Percentage of options vesting rights 50.00%    
Employee Performance Based Stock Option [Member] | Share-based Compensation Award, Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options vesting rights 50.00%    
Employee Performance Based Stock Option [Member] | Options Granted in Current Year | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting rights over four years in 25% increments on December 31, 2020, 2021, 2022, and 2023    
Employee Performance Based Stock Option [Member] | Options Granted in Current Year | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting rights over two years in 50% increments on December 31, 2020 and 2021    
Performance Based Restricted Stock Unit [Member] | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 2 years    
Percentage of options vesting rights 50.00%    
Performance Based Restricted Stock Unit [Member] | Options Granted in Current Year | Share-based Compensation Award, Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting rights over two years in 50% increments on December 31, 2022 and 2023    
Minimum | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 2 years    
Minimum | Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 3 years    
Maximum | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 6 years    
Maximum | Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share units vesting period or option vesting period 6 years