Leases - Summary of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019
Leases [Abstract]
Operating lease expense	$ 1,785	$ 5,582
Short-term lease expense	947	3,288
Total lease expense	$ 2,732	$ 8,870