Quarterly Financial Data (Unaudited) - Selected Quarterly Data (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 28, 2020	Sep. 27, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 787,833	$ 666,240	$ 643,303	$ 617,253	$ 697,085	$ 697,717	$ 695,607	$ 673,484	$ 1,260,556	$ 1,926,795	$ 2,714,628	$ 2,763,893	$ 2,608,562
Cost of revenues	623,390	512,877	496,678	465,208	559,940	565,703	540,772	517,159	961,886	1,474,763	2,098,153	2,183,574	1,991,622
Operating (loss) income	$ 20,482	28,532	34,295	7,457	(3,167)	(10,525)	26,158	14,353	41,753	70,284	90,766	26,819	50,121
Net (loss) income		$ 15,731	$ (2,681)	$ 26,150	$ (16,664)	$ (31,625)	$ 3,388	$ (5,160)	$ 23,469	$ 39,199	$ 27,286	$ (50,061)	$ (31,578)