Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plan - Additional Information (Detail)

v3.10.0.1
Employee Benefit Plan - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]      
Maximum annual contributions per employee percent 15.00%    
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 contribution $ 2,300,000 $ 1,600,000 $ 0
Deferred Compensation Plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Employer contribution $ 100,000 $ 200,000 $ 0