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Revenue from Contracts with Customers (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2019 and 2018 (in thousands):
 
For the three months ended June 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States electrical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
286,290

 
50
%
 
$
199,283

 
41
%
Institutional market sector
31,596

 
5
%
 
31,060

 
6
%
Hospitality market sector
2,846

 
1
%
 
7,289

 
2
%
Manufacturing market sector
118,157

 
21
%
 
94,018

 
20
%
Healthcare market sector
21,409

 
4
%
 
36,679

 
8
%
Transportation market sector
51,655

 
9
%
 
72,511

 
15
%
Water and wastewater market sector
4,618

 
1
%
 
6,140

 
1
%
Short duration projects (1)
41,447

 
7
%
 
25,195

 
5
%
Service work
12,003

 
2
%
 
8,836

 
2
%
 
570,021

 

 
481,011

 
 
Less intersegment revenues
(619
)
 


 
(1,469
)
 
 
Total segment revenues
$
569,402

 

 
$
479,542

 
 
United States mechanical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
299,448

 
36
%
 
$
262,480

 
36
%
Institutional market sector
76,674

 
9
%
 
77,499

 
11
%
Hospitality market sector
8,271

 
1
%
 
21,191

 
3
%
Manufacturing market sector
137,891

 
17
%
 
89,140

 
12
%
Healthcare market sector
74,653

 
9
%
 
59,950

 
8
%
Transportation market sector
9,291

 
1
%
 
4,724

 
1
%
Water and wastewater market sector
45,537

 
6
%
 
42,491

 
6
%
Short duration projects (1)
81,168

 
10
%
 
71,090

 
10
%
Service work
92,432

 
11
%
 
98,301

 
13
%
 
825,365

 

 
726,866

 
 
Less intersegment revenues
(2,279
)
 


 
(2,984
)
 
 
Total segment revenues
$
823,086

 

 
$
723,882

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




 
For the three months ended June 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States building services:
 
 
 
 
 
 
 
Commercial site-based services
$
130,921

 
25
%
 
$
119,043

 
26
%
Government site-based services
42,787

 
8
%
 
55,147

 
12
%
Mechanical services
312,822

 
60
%
 
260,249

 
56
%
Energy services
37,168

 
7
%
 
26,594

 
6
%
Total segment revenues
$
523,698

 

 
$
461,033

 
 
United States industrial services:
 
 

 
 
 
 
Field services
$
252,849

 
86
%
 
$
142,302

 
77
%
Shop services
42,611

 
14
%
 
41,620

 
23
%
Total segment revenues
$
295,460

 

 
$
183,922

 
 
 
 
 
 
 
 
 
 
Total United States operations
$
2,211,646

 
 
 
$
1,848,379

 
 
United Kingdom building services:
 
 
 
 
 
 
 
Service work
$
56,829

 
50
%
 
$
54,998

 
52
%
Projects & extras
55,727

 
50
%
 
50,509

 
48
%
Total segment revenues
$
112,556

 

 
$
105,507

 
 
 
 
 

 
 
 
 
Total worldwide operations
$
2,324,202

 

 
$
1,953,886

 
 


 
For the six months ended June 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States electrical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
555,731

 
51
%
 
$
383,665

 
41
%
Institutional market sector
53,941

 
5
%
 
59,068

 
6
%
Hospitality market sector
9,687

 
1
%
 
12,805

 
1
%
Manufacturing market sector
216,960

 
20
%
 
179,812

 
19
%
Healthcare market sector
39,024

 
3
%
 
75,186

 
8
%
Transportation market sector
109,794

 
10
%
 
143,775

 
16
%
Water and wastewater market sector
10,633

 
1
%
 
10,753

 
1
%
Short duration projects (1)
81,856

 
7
%
 
54,725

 
6
%
Service work
21,265

 
2
%
 
17,004

 
2
%
 
1,098,891

 
 
 
936,793

 
 
Less intersegment revenues
(1,419
)
 
 
 
(2,499
)
 
 
Total segment revenues
$
1,097,472

 
 
 
$
934,294

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

 
For the six months ended June 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States mechanical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
581,310

 
37
%
 
$
493,279

 
35
%
Institutional market sector
137,957

 
9
%
 
142,154

 
10
%
Hospitality market sector
21,919

 
1
%
 
47,718

 
3
%
Manufacturing market sector
236,654

 
15
%
 
181,354

 
13
%
Healthcare market sector
136,027

 
9
%
 
125,826

 
9
%
Transportation market sector
15,025

 
1
%
 
9,930

 
1
%
Water and wastewater market sector
88,748

 
6
%
 
79,242

 
5
%
Short duration projects (1)
181,104

 
11
%
 
150,812

 
11
%
Service work
181,898

 
11
%
 
184,526

 
13
%
 
1,580,642

 
 
 
1,414,841

 
 
Less intersegment revenues
(5,147
)
 
 
 
(6,209
)
 
 
Total segment revenues
$
1,575,495

 
 
 
$
1,408,632

 
 
 ________
(1)
Represents those projects which generally are completed within three months or less.
 
For the six months ended June 30,
 
2019
 
% of
Total
 
2018
 
% of
Total
United States building services:
 
 
 
 
 
 
 
Commercial site-based services
$
286,899

 
28
%
 
$
265,804

 
29
%
Government site-based services
91,578

 
9
%
 
110,556

 
12
%
Mechanical services
586,988

 
56
%
 
487,591

 
53
%
Energy services
70,312

 
7
%
 
51,834

 
6
%
Total segment revenues
$
1,035,777

 
 
 
$
915,785

 
 
United States industrial services:
 
 
 
 
 
 
 
Field services
$
469,619

 
85
%
 
$
304,489

 
79
%
Shop services
84,486

 
15
%
 
78,677

 
21
%
Total segment revenues
$
554,105

 
 
 
$
383,166

 
 
 
 
 
 
 
 
 
 
Total United States operations
$
4,262,849

 
 
 
$
3,641,877

 
 
United Kingdom building services:
 
 
 
 
 
 
 
Service work
$
111,463

 
51
%
 
$
110,273

 
52
%
Projects & extras
108,618

 
49
%
 
102,124

 
48
%
Total segment revenues
$
220,081

 
 
 
$
212,397

 
 
 
 
 
 
 
 
 
 
Total worldwide operations
$
4,482,930

 
 
 
$
3,854,274

 
 
Contract Assets and Contract Liabilities
Net contract liabilities consisted of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
Contract assets, current
$
179,439

 
$
158,243

Contract assets, non-current
—

 
—

Contract liabilities, current
(544,346
)
 
(552,290
)
Contract liabilities, non-current
(2,090
)
 
(2,069
)
Net contract liabilities
$
(366,997
)
 
$
(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):
 
June 30, 2019
 
% of Total
Remaining performance obligations:
 
 
 
United States electrical construction and facilities services
$
1,175,333

 
28
%
United States mechanical construction and facilities services
2,290,438

 
54
%
United States building services
545,776

 
13
%
United States industrial services
89,247

 
2
%
Total United States operations
4,100,794

 
97
%
United Kingdom building services
125,201

 
3
%
Total worldwide operations
$
4,225,995

 
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
$
1,120,717

 
$
54,616

United States mechanical construction and facilities services
1,742,820

 
547,618

United States building services
537,951

 
7,825

United States industrial services
89,247

 
—

Total United States operations
3,490,735

 
610,059

United Kingdom building services
77,211

 
47,990

Total worldwide operations
$
3,567,946

 
$
658,049