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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2020 and 2019 (in thousands):
For the three months ended September 30,
2020% of
Total		2019% of
Total
United States electrical construction and facilities services:
Commercial market sector$253,436 50 %$260,871 47 %
Institutional market sector38,135 7 %33,702 6 %
Hospitality market sector7,028 1 %2,243 1 %
Manufacturing market sector92,789 18 %121,488 22 %
Healthcare market sector18,876 4 %24,701 4 %
Transportation market sector58,765 12 %52,744 9 %
Water and wastewater market sector2,351 1 %3,709 1 %
Short duration projects (1)
27,321 5 %42,296 7 %
Service work11,978 2 %14,174 3 %
510,679 555,928 
Less intersegment revenues(1,816)(1,291)
Total segment revenues$508,863 $554,637 
For the three months ended September 30,
2020% of
Total		2019% of
Total
United States mechanical construction and facilities services:
Commercial market sector$346,911 39 %$293,202 33 %
Institutional market sector112,264 13 %94,886 11 %
Hospitality market sector12,570 1 %6,888 1 %
Manufacturing market sector93,919 11 %150,199 17 %
Healthcare market sector78,814 9 %84,418 10 %
Transportation market sector19,824 2 %7,855 1 %
Water and wastewater market sector45,255 5 %42,637 5 %
Short duration projects (1)
84,461 9 %91,897 10 %
Service work99,649 11 %100,196 12 %
893,667 872,178 
Less intersegment revenues(2,158)(2,990)
Total segment revenues$891,509 $869,188 
 ________
(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 September 30,
2020% of
Total		2019% of
Total
United States building services:
Commercial site-based services$147,768 27 %$133,179 25 %
Government site-based services44,664 8 %42,412 8 %
Mobile mechanical services336,320 61 %333,696 63 %
Energy services22,803 4 %22,835 4 %
Total segment revenues$551,555 $532,122 
For the three months ended September 30,
2020% of
Total		2019% of
Total
United States industrial services:
Field services$113,345 81 %$194,569 83 %
Shop services26,367 19 %39,597 17 %
Total segment revenues$139,712 $234,166 
Total United States operations$2,091,639 $2,190,113 
For the three months ended September 30,
2020% of
Total		2019% of
Total
United Kingdom building services:
Service work$55,594 51 %$49,098 50 %
Project work54,481 49 %48,530 50 %
Total segment revenues$110,075 $97,628 
Total worldwide operations$2,201,714 $2,287,741 
 
For the nine months ended September 30,
2020% of
Total		2019% of
Total
United States electrical construction and facilities services:
Commercial market sector$711,562 48 %$816,602 49 %
Institutional market sector113,994 8 %87,643 5 %
Hospitality market sector17,009 1 %11,930 1 %
Manufacturing market sector297,414 20 %338,448 20 %
Healthcare market sector57,218 4 %63,725 4 %
Transportation market sector150,911 10 %162,538 10 %
Water and wastewater market sector6,587 1 %14,342 1 %
Short duration projects (1)
90,218 6 %124,152 8 %
Service work38,467 2 %35,439 2 %
1,483,380 1,654,819 
Less intersegment revenues(3,407)(2,710)
Total segment revenues$1,479,973 $1,652,109 
 ________
(1)Represents those projects which generally are completed within three months or less.
NOTE 3 Revenue from Contracts with Customers - (Continued)
For the nine months ended September 30,
2020% of
Total		2019% of
Total
United States mechanical construction and facilities services:
Commercial market sector$925,035 37 %$874,512 36 %
Institutional market sector289,090 12 %232,843 9 %
Hospitality market sector29,382 1 %28,807 1 %
Manufacturing market sector310,109 12 %386,853 16 %
Healthcare market sector247,401 10 %220,445 9 %
Transportation market sector53,839 2 %22,880 1 %
Water and wastewater market sector131,374 5 %131,385 5 %
Short duration projects (1)
255,618 10 %273,001 11 %
Service work279,226 11 %282,094 12 %
2,521,074 2,452,820 
Less intersegment revenues(5,012)(8,137)
Total segment revenues$2,516,062 $2,444,683 
 ________
(1)Represents those projects which generally are completed within three months or less.

For the nine months ended September 30,
2020% of
Total		2019% of
Total
United States building services:
Commercial site-based services$423,284 27 %$420,078 27 %
Government site-based services126,000 8 %133,990 8 %
Mobile mechanical services922,676 60 %920,684 59 %
Energy services70,094 5 %93,147 6 %
Total segment revenues$1,542,054 $1,567,899 
For the nine months ended September 30,
2020% of
Total		2019% of
Total
United States industrial services:
Field services$560,462 85 %$664,188 84 %
Shop services101,447 15 %124,083 16 %
Total segment revenues$661,909 $788,271 
Total United States operations$6,199,998 $6,452,962 
For the nine months ended September 30,
2020% of
Total		2019% of
Total
United Kingdom building services:
Service work$161,839 51 %$160,561 51 %
Project work153,730 49 %157,148 49 %
Total segment revenues$315,569 $317,709 
Total worldwide operations$6,515,567 $6,770,671 
Contract Assets and Contract Liabilities Net contract liabilities consisted of the following as of September 30, 2020 and December 31, 2019 (in thousands):
September 30, 2020December 31, 2019
Contract assets, current$187,313 $177,830 
Contract assets, non-current— — 
Contract liabilities, current(714,686)(623,642)
Contract liabilities, non-current(2,161)(2,142)
Net contract liabilities$(529,534)$(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 September 30, 2020 (in thousands, except for percentages):
September 30, 2020% of Total
Remaining performance obligations:
United States electrical construction and facilities services$1,062,150 23 %
United States mechanical construction and facilities services2,633,017 58 %
United States building services625,756 14 %
United States industrial services75,662 2 %
Total United States operations4,396,585 97 %
United Kingdom building services133,566 3 %
Total worldwide operations$4,530,151 100 %
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$849,816 $212,334 
United States mechanical construction and facilities services1,988,913 644,104 
United States building services595,507 30,249 
United States industrial services75,662 — 
Total United States operations3,509,898 886,687 
United Kingdom building services99,827 33,739 
Total worldwide operations$3,609,725 $920,426