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Acquisitions, Goodwill, and Other Intangible Assets, Net - 2022 and 2021 Acquisitions - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
yr
shares
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
yr
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
acquisition
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
yr
acquisition
shares
Business Acquisition [Line Items]                  
Cash paid for acquisitions, net of cash acquired             $ 71,841 $ 604,907  
Goodwill   $ 1,520,575 $ 1,493,843   $ 1,520,575   1,493,843   $ 1,520,575
Fair value adjustment related to resolved contingent payments     (143)     $ 0 (1,459) $ 0  
Oil and Gas                  
Business Acquisition [Line Items]                  
Goodwill   436,600 445,500   436,600   445,500   436,600
Power Delivery                  
Business Acquisition [Line Items]                  
Goodwill   303,400 268,200   303,400   $ 268,200   $ 303,400
2022 Acquisitions                  
Business Acquisition [Line Items]                  
Business combinations, number of acquisitions | acquisition             4    
Cash paid for acquisitions, net of cash acquired             $ 50,200    
Estimated fair value of contingent consideration     3,900       3,900    
2021 Acquisitions                  
Business Acquisition [Line Items]                  
Business combinations, number of acquisitions | acquisition                 14
Cash paid for acquisitions, net of cash acquired                 $ 1,269,000
Estimated fair value of contingent consideration   103,000     103,000       103,000
Amortizing intangible assets   608,600     608,600       608,600
Goodwill   $ 237,300     237,300       237,300
Business acquisition, goodwill, expected tax deductible amount     155,000       155,000    
Bargain purchase gain                 3,600
Total consideration                 1,553,600
Shares transferred                 $ 181,700
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, low     9,000       9,000    
Acquisition-related contingent consideration liabilities, range of potential undiscounted earn-out liabilities, high     120,000       120,000    
2021 Acquisitions | Power Delivery                  
Business Acquisition [Line Items]                  
Bargain purchase gain         $ 3,600   200    
2021 Acquisitions | Minimum | Expected Term                  
Business Acquisition [Line Items]                  
Business combinations, contingent consideration, earn-out period (in years) | yr   1     1       1
2021 Acquisitions | Maximum | Expected Term                  
Business Acquisition [Line Items]                  
Business combinations, contingent consideration, earn-out period (in years) | yr   5     5       5
HMG                  
Business Acquisition [Line Items]                  
Cash paid for acquisitions, net of cash acquired                 $ 402,400
Amortizing intangible assets   $ 164,400     $ 164,400       $ 164,400
Amortizing intangible assets, weighted average useful life                 11 years
Goodwill   $ 71,400     71,400       $ 71,400
Bargain purchase gain                 0
Total consideration                 584,100
Business acquisition, number of shares issued (in shares) | shares 133,000 1,975,000              
Shares transferred                 181,700
HMG | Contingent Consideration, Value Of Common Stock                  
Business Acquisition [Line Items]                  
Estimated fair value of contingent consideration   $ 65,000     65,000       $ 65,000
Total consideration $ 29,400                
Business acquisition, cash payment $ 18,000                
Business acquisition, number of shares issued (in shares) | shares 133,157                
Fair value adjustment related to resolved contingent payments       $ 15,000          
Realized gain (loss) included in other income     1,000       1,000    
HMG | Power Delivery                  
Business Acquisition [Line Items]                  
Business acquisition, number of shares issued (in shares) | shares                 2,000,000
Shares transferred                 $ 182,000
HMG | Power Delivery | Contingent Consideration, Value Of Common Stock                  
Business Acquisition [Line Items]                  
Estimated fair value of contingent consideration     31,000       $ 31,000    
Business acquisition, number of shares issued (in shares) | shares             160,000    
Unrealized gain (loss) included in other income     1,300       $ 4,500    
HMG | Power Delivery | Contingent Consideration, Collections From Acquired Receivables                  
Business Acquisition [Line Items]                  
Estimated fair value of contingent consideration     $ 3,900       $ 3,900    
Business acquisition, number of shares issued (in shares) | shares             17,500    
Unrealized gain (loss) included in other income             $ 1,600    
HMG | Customer Relationships                  
Business Acquisition [Line Items]                  
Amortizing intangible assets   132,000     132,000       $ 132,000
Amortizing intangible assets, weighted average useful life                 12 years
All other                  
Business Acquisition [Line Items]                  
Cash paid for acquisitions, net of cash acquired                 $ 866,600
Amortizing intangible assets   444,200     444,200       $ 444,200
Amortizing intangible assets, weighted average useful life                 17 years
Goodwill   $ 165,900     $ 165,900       $ 165,900
Bargain purchase gain                 3,600
Total consideration                 969,500
Shares transferred                 0
All other | Power Delivery                  
Business Acquisition [Line Items]                  
Cash paid for acquisitions, net of cash acquired                 $ 78,000
All other | Minimum | Expected Term | Power Delivery                  
Business Acquisition [Line Items]                  
Business combinations, contingent consideration, earn-out period (in years) | yr   1     1       1
All other | Customer Relationships                  
Business Acquisition [Line Items]                  
Amortizing intangible assets, weighted average useful life                 17 years
INTREN | Power Delivery                  
Business Acquisition [Line Items]                  
Goodwill   $ 49,000     $ 49,000       $ 49,000
Total consideration                 455,000
INTREN | Customer Relationships And Trade Names | Power Delivery                  
Business Acquisition [Line Items]                  
Amortizing intangible assets   $ 281,000     $ 281,000       $ 281,000
Amortizing intangible assets, weighted average useful life                 20 years