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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 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 (in thousands):
 
2019
 
% of
Total
 
2018
 
% of
Total
United States electrical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
1,081,737

 
49
%
 
$
839,045

 
43
%
Institutional market sector
125,537

 
6
%
 
110,046

 
6
%
Hospitality market sector
16,985

 
1
%
 
32,338

 
2
%
Manufacturing market sector
462,953

 
21
%
 
388,157

 
20
%
Healthcare market sector
88,752

 
4
%
 
126,218

 
6
%
Transportation market sector
210,515

 
9
%
 
284,464

 
14
%
Water and wastewater market sector
19,921

 
1
%
 
23,337

 
1
%
Short duration projects (1)
158,619

 
7
%
 
120,109

 
6
%
Service work
54,955

 
2
%
 
34,105

 
2
%
 
2,219,974

 
 
 
1,957,819

 
 
Less intersegment revenues
(3,374
)
 
 
 
(3,496
)
 
 
Total segment revenues
$
2,216,600

 
 
 
$
1,954,323

 
 
 
2019
 
% of
Total
 
2018
 
% of
Total
United States mechanical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
1,185,129

 
36
%
 
$
1,057,542

 
35
%
Institutional market sector
313,409

 
9
%
 
289,882

 
10
%
Hospitality market sector
35,385

 
1
%
 
93,827

 
3
%
Manufacturing market sector
533,699

 
16
%
 
393,637

 
13
%
Healthcare market sector
304,622

 
9
%
 
240,818

 
8
%
Transportation market sector
32,686

 
1
%
 
19,415

 
1
%
Water and wastewater market sector
202,428

 
6
%
 
176,546

 
6
%
Short duration projects (1)
365,721

 
11
%
 
318,413

 
11
%
Service work
378,839

 
11
%
 
385,671

 
13
%
 
3,351,918

 
 
 
2,975,751

 
 
Less intersegment revenues
(11,581
)
 
 
 
(12,908
)
 
 
Total segment revenues
$
3,340,337

 
 
 
$
2,962,843

 
 
 ________
(1)
Represents those projects which generally are completed within three months or less.
 
2019
 
% of
Total
 
2018
 
% of
Total
United States building services:
 
 
 
 
 
 
 
Commercial site-based services
$
571,345

 
27
%
 
$
519,641

 
28
%
Government site-based services
176,282

 
8
%
 
213,677

 
11
%
Mechanical services
1,238,420

 
59
%
 
1,032,082

 
55
%
Energy services
120,825

 
6
%
 
110,085

 
6
%
Total segment revenues
$
2,106,872

 
 
 
$
1,875,485

 
 

 
2019
 
% of
Total
 
2018
 
% of
Total
United States industrial services:
 
 
 
 
 
 
 
Field services
$
922,308

 
85
%
 
$
752,458

 
82
%
Shop services
165,235

 
15
%
 
170,651

 
18
%
Total segment revenues
1,087,543

 
 
 
923,109

 

 
 
 
 
 
 
 

Total United States operations
$
8,751,352

 
 
 
$
7,715,760

 
 

 
2019
 
% of
Total
 
2018
 
% of
Total
United Kingdom building services:
 
 
 
 
 
 
 
Service work
$
212,876

 
50
%
 
$
216,880

 
52
%
Projects & extras
210,383

 
50
%
 
197,991

 
48
%
Total segment revenues
$
423,259

 
 
 
$
414,871

 
 
 
 
 
 
 
 
 
 
Total worldwide operations
$
9,174,611

 
 
 
$
8,130,631

 
 
Contract Assets and Contract Liabilities
Net contract liabilities consisted of the following (in thousands):
 
2019
 
2018
Contract assets, current
$
177,830

 
$
158,243

Contract assets, non-current
—

 
—

Contract liabilities, current
(623,642
)
 
(552,290
)
Contract liabilities, non-current
(2,142
)
 
(2,069
)
Net contract liabilities
$
(447,954
)
 
$
(396,116
)
Net Contract Liabilities on Uncompleted Construction Projects
Included within net contract liabilities were $406.6 million and $359.2 million of net contract liabilities on uncompleted construction projects as of December 31, 2019 and 2018, respectively, as follows (in thousands):
 
2019
 
2018
Costs incurred on uncompleted construction contracts
$
9,885,192

 
$
8,656,642

Estimated earnings, thereon
1,349,338

 
1,172,224

 
11,234,530

 
9,828,866

Less: billings to date
11,641,082

 
10,188,023

 
$
(406,552
)
 
$
(359,157
)
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):
 
2019
 
% of Total
Remaining performance obligations:
 
 
 
United States electrical construction and facilities services
$
1,036,216

 
26
%
United States mechanical construction and facilities services
2,229,090

 
55
%
United States building services
542,269

 
13
%
United States industrial services
104,613

 
3
%
Total United States operations
3,912,188

 
97
%
United Kingdom building services
124,176

 
3
%
Total worldwide operations
$
4,036,364

 
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
$
861,268

 
$
174,948

        United States mechanical construction and facilities services
1,802,865

 
426,225

        United States building services
532,540

 
9,729

        United States industrial services
104,613

 
—

        Total United States operations
3,301,286

 
610,902

        United Kingdom building services
83,558

 
40,618

        Total worldwide operations
$
3,384,844

 
$
651,520