Leases - Summary of Balances Related to Leases within Condensed Consolidated Statement of Cash Flow (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019
Cash flows from operating activities impact:
Operating leases	$ 14,134	$ 13,576
Interest payments on financing lease obligations	1,120	2,083
Total cash flows from operating activities impact	15,254	15,659
Cash flows from financing activities impact:
Principal payments on financing lease obligations	4,428	6,441
Total cash flows from financing activities impact	$ 4,428	$ 6,441