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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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