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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, 2020
Dec. 31, 2019
Changes in the carrying amount of goodwill    
Balance at beginning of year $ 332,447 $ 235,182
Acquisitions and purchase price adjustments (See Note 5) 131,945 97,265
Balance at end of period 464,392 332,447
Mechanical Services Segment    
Changes in the carrying amount of goodwill    
Balance at beginning of year 234,660 235,182
Acquisitions and purchase price adjustments (See Note 5) 72,788 579
Impact of segment reorganization   (1,101)
Balance at end of period 307,448 234,660
Accumulated impairment charges 116,600 116,600
Electrical Services    
Changes in the carrying amount of goodwill    
Balance at beginning of year 97,787  
Acquisitions and purchase price adjustments (See Note 5) 59,157 96,686
Impact of segment reorganization   1,101
Balance at end of period $ 156,944 $ 97,787