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Revenue from Contracts with Customers - Schedule of Disaggregation of Revenues (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2020

Sep. 30, 2019

Sep. 30, 2020

Sep. 30, 2019

Disaggregation of Revenue [Line Items]

Revenues

$ 2,201,714

$ 2,287,741

$ 6,515,567

$ 6,770,671

UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

2,091,639

2,190,113

6,199,998

6,452,962

United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

508,863

554,637

1,479,973

1,652,109

United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

891,509

869,188

2,516,062

2,444,683

United States Building Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

551,555

532,122

1,542,054

1,567,899

United States Industrial Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

139,712

234,166

661,909

788,271

United Kingdom Building Services [Member] [Member] | UNITED KINGDOM

Disaggregation of Revenue [Line Items]

Revenues

110,075

97,628

315,569

317,709

Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

510,679

555,928

1,483,380

1,654,819

Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

893,667

872,178

2,521,074

2,452,820

Intersegment Eliminations [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

(1,816)

(1,291)

(3,407)

(2,710)

Intersegment Eliminations [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

(2,158)

(2,990)

(5,012)

(8,137)

Commercial Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 253,436

$ 260,871

$ 711,562

$ 816,602

Percent of individual segment

50.00%

47.00%

48.00%

49.00%

Commercial Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 346,911

$ 293,202

$ 925,035

$ 874,512

Percent of individual segment

39.00%

33.00%

37.00%

36.00%

Institutional Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 38,135

$ 33,702

$ 113,994

$ 87,643

Percent of individual segment

7.00%

6.00%

8.00%

5.00%

Institutional Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 112,264

$ 94,886

$ 289,090

$ 232,843

Percent of individual segment

13.00%

11.00%

12.00%

9.00%

Hospitality Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 7,028

$ 2,243

$ 17,009

$ 11,930

Percent of individual segment

1.00%

1.00%

1.00%

1.00%

Hospitality Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 12,570

$ 6,888

$ 29,382

$ 28,807

Percent of individual segment

1.00%

1.00%

1.00%

1.00%

Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 92,789

$ 121,488

$ 297,414

$ 338,448

Percent of individual segment

18.00%

22.00%

20.00%

20.00%

Manufacturing Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 93,919

$ 150,199

$ 310,109

$ 386,853

Percent of individual segment

11.00%

17.00%

12.00%

16.00%

Healthcare Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 18,876

$ 24,701

$ 57,218

$ 63,725

Percent of individual segment

4.00%

4.00%

4.00%

4.00%

Healthcare Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 78,814

$ 84,418

$ 247,401

$ 220,445

Percent of individual segment

9.00%

10.00%

10.00%

9.00%

Transportation Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 58,765

$ 52,744

$ 150,911

$ 162,538

Percent of individual segment

12.00%

9.00%

10.00%

10.00%

Transportation Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 19,824

$ 7,855

$ 53,839

$ 22,880

Percent of individual segment

2.00%

1.00%

2.00%

1.00%

Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 2,351

$ 3,709

$ 6,587

$ 14,342

Percent of individual segment

1.00%

1.00%

1.00%

1.00%

Water and Wastewater Market Sector [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 45,255

$ 42,637

$ 131,374

$ 131,385

Percent of individual segment

5.00%

5.00%

5.00%

5.00%

Short Duration Projects [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 27,321

^[1]

$ 42,296

^[1]

$ 90,218

^[2]

$ 124,152

^[2]

Percent of individual segment

5.00%

7.00%

6.00%

8.00%

Short Duration Projects [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 84,461

^[1]

$ 91,897

^[1]

$ 255,618

^[2]

$ 273,001

^[2]

Percent of individual segment

9.00%

10.00%

10.00%

11.00%

Service Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM

Disaggregation of Revenue [Line Items]

Revenues

$ 55,594

$ 49,098

$ 161,839

$ 160,561

Percent of individual segment

51.00%

50.00%

51.00%

51.00%

Service Work [Member] | Operating Segments [Member] | United States Electrical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 11,978

$ 14,174

$ 38,467

$ 35,439

Percent of individual segment

2.00%

3.00%

2.00%

2.00%

Service Work [Member] | Operating Segments [Member] | United States Mechanical Construction And Facilities Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 99,649

$ 100,196

$ 279,226

$ 282,094

Percent of individual segment

11.00%

12.00%

11.00%

12.00%

Commercial Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 147,768

$ 133,179

$ 423,284

$ 420,078

Percent of individual segment

27.00%

25.00%

27.00%

27.00%

Government Site-Based Services [Member] | United States Building Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 44,664

$ 42,412

$ 126,000

$ 133,990

Percent of individual segment

8.00%

8.00%

8.00%

8.00%

Mobile Mechanical Services [Member] | United States Building Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 336,320

$ 333,696

$ 922,676

$ 920,684

Percent of individual segment

61.00%

63.00%

60.00%

59.00%

Energy Services [Member] | United States Building Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 22,803

$ 22,835

$ 70,094

$ 93,147

Percent of individual segment

4.00%

4.00%

5.00%

6.00%

Field Services [Member] | United States Industrial Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 113,345

$ 194,569

$ 560,462

$ 664,188

Percent of individual segment

81.00%

83.00%

85.00%

84.00%

Shop Services [Member] | United States Industrial Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

$ 26,367

$ 39,597

$ 101,447

$ 124,083

Percent of individual segment

19.00%

17.00%

15.00%

16.00%

Project Work [Member] | United Kingdom Building Services [Member] [Member] | UNITED KINGDOM

Disaggregation of Revenue [Line Items]

Revenues

$ 54,481

$ 48,530

$ 153,730

$ 157,148

Percent of individual segment

49.00%

50.00%

49.00%

49.00%

[1]	Represents those projects which generally are completed within three months or less.
[2]	Represents those projects which generally are completed within three months or less.

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