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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, 2025
Dec. 31, 2024
Changes in the carrying amount of goodwill    
Balance at beginning of year $ 875,270 $ 666,834
Acquisitions and purchase price adjustments (See Note 5) 150,245 208,436
Balance at end of period 1,025,515 875,270
Mechanical Segment    
Changes in the carrying amount of goodwill    
Balance at beginning of year 601,512 393,276
Acquisitions and purchase price adjustments (See Note 5) 52,897 208,236
Balance at end of period 654,409 601,512
Accumulated impairment charges 116,600 116,600
Electrical Segment    
Changes in the carrying amount of goodwill    
Balance at beginning of year 273,758 273,558
Acquisitions and purchase price adjustments (See Note 5) 97,348 200
Balance at end of period $ 371,106 $ 273,758