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Acquisitions - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended			12 Months Ended
	Jul. 31, 2019	Jan. 07, 2019	May 31, 2018	Sep. 30, 2019	Sep. 28, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 28, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Amortization of intangible assets				$ 22,100	$ 14,800	$ 64,500	$ 22,700
Goodwill				1,050,077		1,050,077			$ 736,938
Revenues				1,023,277	976,157	2,917,424		$ 2,631,568
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				13,200	13,000	41,200		17,300
Goodwill			$ 243,471	243,500		243,500
Goodwill deductible for tax purposes				50,100		50,100
Revenues				96,900	$ 94,800	293,000		$ 124,700
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		0		5,900		17,800
Goodwill		183,540
Goodwill deductible for tax purposes		16,000
Revenues				33,700		108,700
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				600		5,500
QRC Technologies
Business Acquisition [Line Items]
Percentage of ownership interest acquired	100.00%
Cash paid to acquire	$ 214,100
Amortization of intangible assets				1,900		1,900
Goodwill	128,387
Revenues				5,600		5,600
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				$ 4,700		$ 4,700

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

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