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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenues
The following tables provide further disaggregation of our revenues by categories we use to evaluate our financial performance within each of our reportable segments for the three and six months ended June 30, 2020 and 2019 (in thousands):
For the three months ended June 30,
2020% of
Total		2019% of
Total
United States electrical construction and facilities services:
Commercial market sector$215,285  48 %$286,290  50 %
Institutional market sector34,341  8 %31,596  5 %
Hospitality market sector4,899  1 %2,846  1 %
Manufacturing market sector84,253  19 %118,157  21 %
Healthcare market sector17,696  4 %21,409  4 %
Transportation market sector47,966  10 %51,655  9 %
Water and wastewater market sector1,907  1 %4,618  1 %
Short duration projects (1)
30,176  7 %41,447  7 %
Service work10,193  2 %12,003  2 %
446,716  570,021  
Less intersegment revenues(835) (619) 
Total segment revenues$445,881  $569,402  
For the three months ended June 30,
2020% of
Total		2019% of
Total
United States mechanical construction and facilities services:
Commercial market sector$273,434  35 %$299,448  36 %
Institutional market sector99,829  13 %76,674  9 %
Hospitality market sector9,098  1 %8,271  1 %
Manufacturing market sector100,608  13 %137,891  17 %
Healthcare market sector80,528  10 %74,653  9 %
Transportation market sector19,669  2 %9,291  1 %
Water and wastewater market sector45,606  6 %45,537  6 %
Short duration projects (1)
73,955  9 %81,168  10 %
Service work88,684  11 %92,432  11 %
791,411  825,365  
Less intersegment revenues(970) (2,279) 
Total segment revenues$790,441  $823,086  
 ________
(1)Represents those projects which generally are completed within three months or less.
NOTE 3 Revenue from Contracts with Customers - (Continued)
For the three months ended June 30,
2020% of
Total		2019% of
Total
United States building services:
Commercial site-based services$132,078  28 %$130,921  25 %
Government site-based services38,419  8 %42,787  8 %
Mobile mechanical services282,965  60 %312,822  60 %
Energy services18,954  4 %37,168  7 %
Total segment revenues$472,416  $523,698  
For the three months ended June 30,
2020% of
Total		2019% of
Total
United States industrial services:
Field services$177,361  84 %$252,849  86 %
Shop services34,805  16 %42,611  14 %
Total segment revenues$212,166  $295,460  
Total United States operations$1,920,904  $2,211,646  
For the three months ended June 30,
2020% of
Total		2019% of
Total
United Kingdom building services:
Service work$51,139  55 %$56,829  50 %
Project work41,978  45 %55,727  50 %
Total segment revenues$93,117  $112,556  
Total worldwide operations$2,014,021  $2,324,202  
 
For the six months ended June 30,
2020% of
Total		2019% of
Total
United States electrical construction and facilities services:
Commercial market sector$458,126  47 %$555,731  51 %
Institutional market sector75,859  8 %53,941  5 %
Hospitality market sector9,981  1 %9,687  1 %
Manufacturing market sector204,625  21 %216,960  20 %
Healthcare market sector38,342  4 %39,024  3 %
Transportation market sector92,146  9 %109,794  10 %
Water and wastewater market sector4,236  1 %10,633  1 %
Short duration projects (1)
62,897  6 %81,856  7 %
Service work26,489  3 %21,265  2 %
972,701  1,098,891  
Less intersegment revenues(1,591) (1,419) 
Total segment revenues$971,110  $1,097,472  
 ________
(1)Represents those projects which generally are completed within three months or less.
NOTE 3 Revenue from Contracts with Customers - (Continued)
For the six months ended June 30,
2020% of
Total		2019% of
Total
United States mechanical construction and facilities services:
Commercial market sector$578,124  36 %$581,310  37 %
Institutional market sector176,826  11 %137,957  9 %
Hospitality market sector16,812  1 %21,919  1 %
Manufacturing market sector216,190  13 %236,654  15 %
Healthcare market sector168,587  10 %136,027  9 %
Transportation market sector34,015  2 %15,025  1 %
Water and wastewater market sector86,119  5 %88,748  6 %
Short duration projects (1)
171,157  11 %181,104  11 %
Service work179,577  11 %181,898  11 %
1,627,407  1,580,642  
Less intersegment revenues(2,854) (5,147) 
Total segment revenues$1,624,553  $1,575,495  
 ________
(1)Represents those projects which generally are completed within three months or less.

For the six months ended June 30,
2020% of
Total		2019% of
Total
United States building services:
Commercial site-based services$275,516  28 %$286,899  28 %
Government site-based services81,336  8 %91,578  9 %
Mobile mechanical services586,356  59 %586,988  56 %
Energy services47,291  5 %70,312  7 %
Total segment revenues$990,499  $1,035,777  
For the six months ended June 30,
2020% of
Total		2019% of
Total
United States industrial services:
Field services$447,117  86 %$469,619  85 %
Shop services75,080  14 %84,486  15 %
Total segment revenues$522,197  $554,105  
Total United States operations$4,108,359  $4,262,849  
For the six months ended June 30,
2020% of
Total		2019% of
Total
United Kingdom building services:
Service work$106,245  52 %$111,463  51 %
Project work99,249  48 %108,618  49 %
Total segment revenues$205,494  $220,081  
Total worldwide operations$4,313,853  $4,482,930  
Contract Assets and Contract Liabilities Net contract liabilities consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):
    June 30, 2020December 31, 2019
Contract assets, current$171,389  $177,830  
Contract assets, non-current—  —  
Contract liabilities, current(655,298) (623,642) 
Contract liabilities, non-current(2,066) (2,142) 
Net contract liabilities$(485,975) $(447,954) 
Remaining Performance Obligations
The following table presents the transaction price allocated to remaining unsatisfied performance obligations (“remaining performance obligations”) for each of our reportable segments and their respective percentages of total remaining performance obligations as of June 30, 2020 (in thousands, except for percentages):
    June 30, 2020% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,013,389  22 %
United States mechanical construction and facilities services2,806,213  61 %
United States building services524,617  12 %
United States industrial services102,682  2 %
Total United States operations4,446,901  97 %
United Kingdom building services144,074  3 %
Total worldwide operations$4,590,975  100 %
Remaining Performance Obligations, Expected Timing of Satisfaction
Refer to the table below for additional information regarding our remaining performance obligations, including an estimate of when we expect to recognize such remaining performance obligations as revenue (in thousands):
Within one yearGreater than one year
Remaining performance obligations:
United States electrical construction and facilities services$836,537  $176,852  
United States mechanical construction and facilities services2,145,366  660,847  
United States building services503,843  20,774  
United States industrial services102,682  —  
Total United States operations3,588,428  858,473  
United Kingdom building services110,874  33,200  
Total worldwide operations$3,699,302  $891,673