Leases - Other Information Relating to Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows relating to operating leases	$ (2,212)	$ (1,384)	$ (4,221)	$ (2,960)
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 233		$ 14,838
Weighted average remaining lease term in years
Operating leases	7 years 1 month 6 days	4 years 4 months 17 days	7 years 1 month 6 days	4 years 4 months 17 days
Weighted average discount rate
Operating leases	5.90%	6.20%	5.90%	6.20%