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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands					3 Months Ended								12 Months Ended
	Jul. 31, 2019	Jan. 07, 2019	May 31, 2018	Oct. 06, 2017	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 29, 2017
Business Acquisition [Line Items]
Cash received													$ 494,826	$ 481,163	$ 25,737
Amortization of intangible assets													88,300	37,400	5,600
Goodwill					$ 1,047,425				$ 736,938				1,047,425	736,938	496,786
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
Williams Electric Company, Inc.
Business Acquisition [Line Items]
Cash received				$ 25,700
Polaris Alpha
Business Acquisition [Line Items]
Percentage of ownership interest acquired			100.00%
Cash paid to acquire			$ 489,100
Borrowed under credit agreement to partially fund the acquisition			260,000
Amortization of intangible assets													54,500	30,300
Goodwill			$ 243,471
Goodwill deductible for tax purposes					$ 50,100								50,100
Revenues														227,300
Polaris Alpha | Indirect, General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related expenses														$ 6,200
OGSystems
Business Acquisition [Line Items]
Percentage of ownership interest acquired		100.00%
Cash paid to acquire		$ 292,400
Borrowed under credit agreement to partially fund the acquisition		110,000
Amortization of intangible assets													23,800
Goodwill		183,540
Goodwill deductible for tax purposes		16,000
Revenues													143,400
OGSystems | Term Loan
Business Acquisition [Line Items]
Borrowed under credit agreement to partially fund the acquisition		$ 150,000
OGSystems | Indirect, General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related expenses													5,400
QRC Technologies
Business Acquisition [Line Items]
Percentage of ownership interest acquired	100.00%
Cash paid to acquire	$ 214,100
Amortization of intangible assets													5,700
Goodwill	125,091
Revenues													$ 11,200
QRC Technologies | Revolving Credit Facility
Business Acquisition [Line Items]
Borrowed under credit agreement to partially fund the acquisition	140,000
QRC Technologies | Indirect, General and Administrative Expense
Business Acquisition [Line Items]
Acquisition related expenses	$ 4,900

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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