Retirement Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Compensation And Retirement Disclosure [Abstract]
Benefit obligations	$ 8,700,000		$ 8,700,000
Fair value of benefit plan assets	5,100,000		5,100,000
Unfunded balance of benefit plan	3,600,000		3,600,000
Amounts recognized in accumulated other comprehensive income	500,000		500,000
Contributions to the plan by the Company and its subsidiaries			1,400,000
Benefits expected to be paid from pension plan in 2020	200,000		200,000
Benefits expected to be paid from pension plan in 2021	1,100,000		1,100,000
Benefits expected to be paid from pension plan in 2022	2,200,000		2,200,000
Benefits expected to be paid from pension plan in 2023	900,000		900,000
Benefits expected to be paid from pension plan in 2024	1,000,000.0		1,000,000.0
Aggregate benefits expected to be paid in five years from 2025-2029	4,600,000		$ 4,600,000
Contribution from salary			25.00%
Maximum contribution from salary			$ 19,500
Matching contribution based upon eligibility			3.00%
Discretionary employer contributions	$ 600,000	$ 300,000	$ 1,900,000	$ 900,000