Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Additional Information (Detail)

v3.20.4
Employee Benefit Plans - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items]      
Minimum age for employees to be covered under profit sharing plan 21 years    
Minimum service period for employees to be covered under profit sharing plan 6 months    
Vesting period for company contributions to benefit plan 6 years    
Employer contributions $ 2,800,000 $ 2,400,000 $ 2,300,000
Deferred Compensation Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Employer contributions $ 300,000 $ 100,000 $ 100,000