Leases - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 29, 2019	Sep. 29, 2019	Jan. 01, 2019	Feb. 28, 2016
Total lease expense	$ 9,100	$ 26,600
Variable lease costs	3,000	8,300
Operating Lease, Right-of-Use Asset	57,595	57,595	$ 50,100	$ 50,100
Operating Lease, Liability	$ 65,199	$ 65,199	$ 54,300	$ 54,300
Operating Lease, Weighted Average Remaining Lease Term	4 years 8 months 12 days	4 years 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	5.00%	5.00%
Short-term Lease, Cost	$ 700	$ 2,200