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Goodwill, Identifiable Intangible Assets, and Other Long-Lived Assets (Tables)
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill by reportable segments were as follows during the six months ended June 30, 2020 (in thousands):  
United States
electrical
construction
and facilities
services segment		United States
mechanical
construction
and facilities
services segment		United States
building
services segment		United States
industrial services segment		Total
Balance at December 31, 2019$142,545  $299,220  $289,158  $332,988  $1,063,911  
Acquisitions and purchase price adjustments—  419  942  —  1,361  
Impairments—  —  —  (225,500) (225,500) 
Balance at June 30, 2020$142,545  $299,639  $290,100  $107,488  $839,772  
Schedule of Intangible Assets
Identifiable intangible assets consist of the following as of June 30, 2020 and December 31, 2019 (in thousands):
June 30, 2020
Gross
Carrying
Amount		Accumulated
Amortization		Accumulated
Impairment
Charge		Total
Contract backlog$66,945  $(65,145) $—  $1,800  
Developed technology/Vendor network95,661  (62,575) —  33,086  
Customer relationships645,555  (300,590) (4,834) 340,131  
Trade names (amortized)31,348  (22,332) —  9,016  
Trade names (unamortized)251,440  —  (58,933) 192,507  
Total$1,090,949  $(450,642) $(63,767) 576,540  

December 31, 2019
Gross
Carrying
Amount		Accumulated
Amortization		Accumulated
Impairment
Charge		Total
Contract backlog$66,745  $(61,651) $—  $5,094  
Developed technology/Vendor network95,661  (60,156) —  35,505  
Customer relationships644,755  (277,601) (4,834) 362,320  
Trade names (amortized)31,148  (21,830) —  9,318  
Trade names (unamortized)251,440  —  (52,233) 199,207  
Total$1,089,749  $(421,238) $(57,067) $611,444