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Goodwill and Identifiable Intangible Assets, Net - Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Changes in the carrying amount of goodwill    
Balance at beginning of year $ 592,114 $ 464,392
Acquisitions and purchase price adjustments (See Note 5) 19,675 127,722
Balance at end of period 611,789 592,114
Mechanical Services Segment    
Changes in the carrying amount of goodwill    
Balance at beginning of year 361,320 307,448
Acquisitions and purchase price adjustments (See Note 5) 2,609 52,771
Impact of segment reorganization   1,101
Balance at end of period 363,929 361,320
Accumulated impairment charges 116,600 116,600
Electrical Services Industry    
Changes in the carrying amount of goodwill    
Balance at beginning of year 230,794 156,944
Acquisitions and purchase price adjustments (See Note 5) 17,066 74,951
Impact of segment reorganization   (1,101)
Balance at end of period $ 247,860 $ 230,794