Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Dec. 30, 2018
Lease expense	$ 1,100
Operating Lease, Liability	30,888	$ 31,500
Lease, cost	859
Short-term lease expense	400
Operating lease right of use asset	$ 26,200	$ 27,000
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	5 years
Lessee Operating Lease Lease Not Yet Commenced Additional Lease Liability	$ 2,800