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Segments Information - Additional Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 28, 2018 USD ($)	Jun. 29, 2018 USD ($)	Mar. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 28, 2018 USD ($)	Dec. 29, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									2
Revenues	$ 1,037,388	$ 1,023,277	$ 989,742	$ 904,405	$ 928,940	$ 976,157	$ 900,732	$ 754,679	$ 3,954,812	$ 3,560,508		$ 3,017,011
Property and equipment, net	122,751				91,849				122,751	91,849		87,578
Litigation-related expenses							(132,004)	2,330	0	129,674		0
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenues	536,965	$ 537,102	$ 511,245	$ 481,593	526,058	$ 532,432	559,667	$ 463,344	2,066,905	2,081,501		1,937,105
Revenue Excluding Claim Settlement										2,000,000
Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Revenues									1,120,563	1,183,863		1,102,725
Revenue Excluding Claim Settlement										1,100,000
Revenue
Segment Reporting Information [Line Items]
Litigation-related expenses							$ (55,100)			55,100
Revenue | Critical Infrastructure | Mobility Solutions
Segment Reporting Information [Line Items]
Litigation-related expenses											$ 55,100
United States
Segment Reporting Information [Line Items]
Revenues									3,000,000	2,600,000		2,100,000
Property and equipment, net	$ 109,900				$ 79,900				$ 109,900	$ 79,900		$ 76,200

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