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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 and 2018 (in thousands):
 
For the three months ended September 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States electrical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
260,871

 
47
%
 
$
196,293

 
40
%
Institutional market sector
33,702

 
6
%
 
27,903

 
6
%
Hospitality market sector
2,243

 
1
%
 
9,860

 
2
%
Manufacturing market sector
121,488

 
22
%
 
100,563

 
20
%
Healthcare market sector
24,701

 
4
%
 
28,121

 
6
%
Transportation market sector
52,744

 
9
%
 
72,816

 
15
%
Water and wastewater market sector
3,709

 
1
%
 
4,194

 
1
%
Short duration projects (1)
42,296

 
7
%
 
38,452

 
8
%
Service work
14,174

 
3
%
 
8,147

 
2
%
 
555,928

 

 
486,349

 
 
Less intersegment revenues
(1,291
)
 


 
(375
)
 
 
Total segment revenues
$
554,637

 

 
$
485,974

 
 
United States mechanical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
293,202

 
33
%
 
$
287,350

 
38
%
Institutional market sector
94,886

 
11
%
 
77,676

 
10
%
Hospitality market sector
6,888

 
1
%
 
26,170

 
3
%
Manufacturing market sector
150,199

 
17
%
 
89,779

 
12
%
Healthcare market sector
84,418

 
10
%
 
55,843

 
7
%
Transportation market sector
7,855

 
1
%
 
3,072

 
1
%
Water and wastewater market sector
42,637

 
5
%
 
43,033

 
6
%
Short duration projects (1)
91,897

 
10
%
 
72,388

 
9
%
Service work
100,196

 
12
%
 
107,168

 
14
%
 
872,178

 

 
762,479

 
 
Less intersegment revenues
(2,990
)
 


 
(2,984
)
 
 
Total segment revenues
$
869,188

 

 
$
759,495

 
 
 ________
(1)
Represents those projects which generally are completed within three months or less.




 
For the three months ended September 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States building services:
 
 
 
 
 
 
 
Commercial site-based services
$
133,179

 
25
%
 
$
120,917

 
26
%
Government site-based services
42,412

 
8
%
 
52,332

 
11
%
Mechanical services
333,696

 
63
%
 
276,722

 
58
%
Energy services
22,835

 
4
%
 
23,730

 
5
%
Total segment revenues
$
532,122

 

 
$
473,701

 
 
United States industrial services:
 
 

 
 
 
 
Field services
$
194,569

 
83
%
 
$
181,873

 
80
%
Shop services
39,597

 
17
%
 
45,440

 
20
%
Total segment revenues
$
234,166

 

 
$
227,313

 
 
 
 
 
 
 
 
 
 
Total United States operations
$
2,190,113

 
 
 
$
1,946,483

 
 
United Kingdom building services:
 
 
 
 
 
 
 
Service work
$
49,098

 
50
%
 
$
51,815

 
52
%
Projects & extras
48,530

 
50
%
 
48,751

 
48
%
Total segment revenues
$
97,628

 

 
$
100,566

 
 
 
 
 

 
 
 
 
Total worldwide operations
$
2,287,741

 

 
$
2,047,049

 
 


 
For the nine months ended September 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States electrical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
816,602

 
49
%
 
$
579,958

 
41
%
Institutional market sector
87,643

 
5
%
 
86,971

 
6
%
Hospitality market sector
11,930

 
1
%
 
22,665

 
2
%
Manufacturing market sector
338,448

 
20
%
 
280,375

 
20
%
Healthcare market sector
63,725

 
4
%
 
103,307

 
7
%
Transportation market sector
162,538

 
10
%
 
216,591

 
15
%
Water and wastewater market sector
14,342

 
1
%
 
14,947

 
1
%
Short duration projects (1)
124,152

 
8
%
 
93,177

 
6
%
Service work
35,439

 
2
%
 
25,151

 
2
%
 
1,654,819

 
 
 
1,423,142

 
 
Less intersegment revenues
(2,710
)
 
 
 
(2,874
)
 
 
Total segment revenues
$
1,652,109

 
 
 
$
1,420,268

 
 
 ________
(1)
Represents those projects which generally are completed within three months or less.

 
For the nine months ended September 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States mechanical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
874,512

 
36
%
 
$
780,629

 
36
%
Institutional market sector
232,843

 
9
%
 
219,830

 
10
%
Hospitality market sector
28,807

 
1
%
 
73,888

 
3
%
Manufacturing market sector
386,853

 
16
%
 
271,133

 
13
%
Healthcare market sector
220,445

 
9
%
 
181,669

 
8
%
Transportation market sector
22,880

 
1
%
 
13,002

 
1
%
Water and wastewater market sector
131,385

 
5
%
 
122,275

 
6
%
Short duration projects (1)
273,001

 
11
%
 
223,200

 
10
%
Service work
282,094

 
12
%
 
291,694

 
13
%
 
2,452,820

 
 
 
2,177,320

 
 
Less intersegment revenues
(8,137
)
 
 
 
(9,193
)
 
 
Total segment revenues
$
2,444,683

 
 
 
$
2,168,127

 
 
 ________
(1)
Represents those projects which generally are completed within three months or less.
 
For the nine months ended September 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States building services:
 
 
 
 
 
 
 
Commercial site-based services
$
420,078

 
27
%
 
$
386,721

 
28
%
Government site-based services
133,990

 
8
%
 
162,888

 
12
%
Mechanical services
920,684

 
59
%
 
764,313

 
55
%
Energy services
93,147

 
6
%
 
75,564

 
5
%
Total segment revenues
$
1,567,899

 
 
 
$
1,389,486

 
 
United States industrial services:
 
 
 
 
 
 
 
Field services
$
664,188

 
84
%
 
$
486,362

 
80
%
Shop services
124,083

 
16
%
 
124,117

 
20
%
Total segment revenues
$
788,271

 
 
 
$
610,479

 
 
 
 
 
 
 
 
 
 
Total United States operations
$
6,452,962

 
 
 
$
5,588,360

 
 
United Kingdom building services:
 
 
 
 
 
 
 
Service work
$
160,561

 
51
%
 
$
162,088

 
52
%
Projects & extras
157,148

 
49
%
 
150,875

 
48
%
Total segment revenues
$
317,709

 
 
 
$
312,963

 
 
 
 
 
 
 
 
 
 
Total worldwide operations
$
6,770,671

 
 
 
$
5,901,323

 
 
Contract Assets and Contract Liabilities
Net contract liabilities consisted of the following (in thousands):
 
September 30, 2019
 
December 31, 2018
Contract assets, current
$
179,005

 
$
158,243

Contract assets, non-current
—

 
—

Contract liabilities, current
(565,957
)
 
(552,290
)
Contract liabilities, non-current
(2,025
)
 
(2,069
)
Net contract liabilities
$
(388,977
)
 
$
(396,116
)
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 (in thousands, except for percentages):
 
September 30, 2019
 
% of Total
Remaining performance obligations:
 
 
 
United States electrical construction and facilities services
$
1,095,254

 
27
%
United States mechanical construction and facilities services
2,190,556

 
54
%
United States building services
544,913

 
14
%
United States industrial services
83,478

 
2
%
Total United States operations
3,914,201

 
97
%
United Kingdom building services
120,887

 
3
%
Total worldwide operations
$
4,035,088

 
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 year
 
Greater than one year
Remaining performance obligations:
 
 
 
United States electrical construction and facilities services
$
999,218

 
$
96,036

United States mechanical construction and facilities services
1,758,285

 
432,271

United States building services
534,628

 
10,285

United States industrial services
83,478

 
—

Total United States operations
3,375,609

 
538,592

United Kingdom building services
80,841

 
40,046

Total worldwide operations
$
3,456,450

 
$
578,638