Accrued Restructuring Costs (Detail) $ in Thousands	9 Months Ended
	Sep. 28, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 502
Charged to expense	14,830
Amount paid	(3,637)
Ending balance	11,695
Employee Separation/ Severance
Restructuring Cost and Reserve [Line Items]
Beginning balance	260
Charged to expense	14,365
Amount paid	(3,139)
Ending balance	11,486
Contract Termination and Other Costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	242
Charged to expense	465
Amount paid	(498)
Ending balance	$ 209