Employee Benefit Plans - Additional Information (Detail) - USD ($)		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Percentage of employee's contribution to the plan up to 6% of base salary matched by the Company		100.00%
Employer's contribution percentage		6.00%
Employer's contribution		$ 4,200,000	$ 3,000,000	$ 2,500,000
401(k) Profit Sharing Plan Two [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer's contribution percentage		6.00%
Employer contribution to the plan for every $1.00 contributed by an employee		$ 0.25
Employee's contribution to the plan up to 6% of base salary by the company		$ 1.00
401(k) Profit Sharing Plan Two [Member] | Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contribution to the plan for every $1.00 contributed by an employee	$ 0.50