Revenue - Schedule of Revenue by Payer Type as a Percentage of Revenue (Detail) - Customer Concentration Risk - Total revenue	3 Months Ended
	Apr. 02, 2022	Apr. 03, 2021
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	100.00%	100.00%
Medicaid MCO
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	49.50%	55.80%
Medicaid
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	22.00%	24.80%
Commercial
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	10.10%	11.30%
Medicare
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	18.30%	7.70%
Self-pay
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	0.10%	0.40%