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

3 Months Ended

6 Months Ended

Jun. 30, 2020

Jun. 30, 2019

Jun. 30, 2020

Jun. 30, 2019

Disaggregation of Revenue [Line Items]

Revenues

$ 2,014,021

$ 2,324,202

$ 4,313,853

$ 4,482,930

UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

1,920,904

2,211,646

4,108,359

4,262,849

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

Disaggregation of Revenue [Line Items]

Revenues

445,881

569,402

971,110

1,097,472

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

Disaggregation of Revenue [Line Items]

Revenues

790,441

823,086

1,624,553

1,575,495

United States Building Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

472,416

523,698

990,499

1,035,777

United States Industrial Services [Member] | UNITED STATES

Disaggregation of Revenue [Line Items]

Revenues

212,166

295,460

522,197

554,105

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

Disaggregation of Revenue [Line Items]

Revenues

93,117

112,556

205,494

220,081

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

Disaggregation of Revenue [Line Items]

Revenues

446,716

570,021

972,701

1,098,891

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

Disaggregation of Revenue [Line Items]

Revenues

791,411

825,365

1,627,407

1,580,642

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

Disaggregation of Revenue [Line Items]

Revenues

(835)

(619)

(1,591)

(1,419)

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

Disaggregation of Revenue [Line Items]

Revenues

(970)

(2,279)

(2,854)

(5,147)

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

Disaggregation of Revenue [Line Items]

Revenues

$ 215,285

$ 286,290

$ 458,126

$ 555,731

Percent of individual segment

48.00%

50.00%

47.00%

51.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 273,434

$ 299,448

$ 578,124

$ 581,310

Percent of individual segment

35.00%

36.00%

36.00%

37.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 34,341

$ 31,596

$ 75,859

$ 53,941

Percent of individual segment

8.00%

5.00%

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

$ 99,829

$ 76,674

$ 176,826

$ 137,957

Percent of individual segment

13.00%

9.00%

11.00%

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

$ 4,899

$ 2,846

$ 9,981

$ 9,687

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

$ 9,098

$ 8,271

$ 16,812

$ 21,919

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

$ 84,253

$ 118,157

$ 204,625

$ 216,960

Percent of individual segment

19.00%

21.00%

21.00%

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

$ 100,608

$ 137,891

$ 216,190

$ 236,654

Percent of individual segment

13.00%

17.00%

13.00%

15.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 17,696

$ 21,409

$ 38,342

$ 39,024

Percent of individual segment

4.00%

4.00%

4.00%

3.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 80,528

$ 74,653

$ 168,587

$ 136,027

Percent of individual segment

10.00%

9.00%

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

$ 47,966

$ 51,655

$ 92,146

$ 109,794

Percent of individual segment

10.00%

9.00%

9.00%

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

$ 19,669

$ 9,291

$ 34,015

$ 15,025

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

$ 1,907

$ 4,618

$ 4,236

$ 10,633

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

$ 45,606

$ 45,537

$ 86,119

$ 88,748

Percent of individual segment

6.00%

6.00%

5.00%

6.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 30,176

^[1]

$ 41,447

^[1]

$ 62,897

^[2]

$ 81,856

^[2]

Percent of individual segment

7.00%

7.00%

6.00%

7.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 73,955

^[1]

$ 81,168

^[1]

$ 171,157

^[2]

$ 181,104

^[2]

Percent of individual segment

9.00%

10.00%

11.00%

11.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 51,139

$ 56,829

$ 106,245

$ 111,463

Percent of individual segment

55.00%

50.00%

52.00%

51.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 10,193

$ 12,003

$ 26,489

$ 21,265

Percent of individual segment

2.00%

2.00%

3.00%

2.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 88,684

$ 92,432

$ 179,577

$ 181,898

Percent of individual segment

11.00%

11.00%

11.00%

11.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 132,078

$ 130,921

$ 275,516

$ 286,899

Percent of individual segment

28.00%

25.00%

28.00%

28.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 38,419

$ 42,787

$ 81,336

$ 91,578

Percent of individual segment

8.00%

8.00%

8.00%

9.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 282,965

$ 312,822

$ 586,356

$ 586,988

Percent of individual segment

60.00%

60.00%

59.00%

56.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 18,954

$ 37,168

$ 47,291

$ 70,312

Percent of individual segment

4.00%

7.00%

5.00%

7.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 177,361

$ 252,849

$ 447,117

$ 469,619

Percent of individual segment

84.00%

86.00%

86.00%

85.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 34,805

$ 42,611

$ 75,080

$ 84,486

Percent of individual segment

16.00%

14.00%

14.00%

15.00%

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

Disaggregation of Revenue [Line Items]

Revenues

$ 41,978

$ 55,727

$ 99,249

$ 108,618

Percent of individual segment

45.00%

50.00%

48.00%

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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