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Segment Information | 12 Months Ended
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Dec. 31, 2019
Segment Reporting [Abstract] |
Segment Information | SEGMENT INFORMATION Our reportable segments reflect certain reclassifications of prior year amounts from our United States mechanical construction and facilities services segment to our United States building services and our United States industrial services segments due to changes in our internal reporting structure. We have the following reportable segments: (a) United States electrical construction and facilities services (involving systems for electrical power transmission and distribution; premises electrical and lighting systems; process instrumentation in the refining, chemical processing, food processing and mining industries; low-voltage systems, such as fire alarm, security and process control; voice and data communication; roadway and transit lighting; and fiber optic lines); (b) United States mechanical construction and facilities services (involving systems for heating, ventilation, air conditioning, refrigeration and clean-room process ventilation; fire protection; plumbing, process and high-purity piping; controls and filtration; water and wastewater treatment and central plant heating and cooling; cranes and rigging; millwrighting; and steel fabrication, erection and welding); (c) United States building services; (d) United States industrial services; and (e) United Kingdom building services. The “United States building services” and “United Kingdom building services” segments principally consist of those operations which provide a portfolio of services needed to support the operation and maintenance of customers’ facilities, including commercial and government site-based operations and maintenance; facility maintenance and services, including reception, security and catering services; outage services to utilities and industrial plants; military base operations support services; mobile mechanical maintenance and services; floor care and janitorial services; landscaping, lot sweeping and snow removal; facilities management; vendor management; call center services; installation and support for building systems; program development, management and maintenance for energy systems; technical consulting and diagnostic services; infrastructure and building projects for federal, state and local governmental agencies and bodies; and small modification and retrofit projects, which services are not generally related to customers’ construction programs. The “United States industrial services” segment principally consists of those operations which provide industrial maintenance and services for refineries, petrochemical plants, and other customers within the oil and gas industry. Services of this segment include refinery turnaround planning and engineering; specialty welding; overhaul and maintenance of critical process units; specialty technical services; on-site repairs, maintenance and service of heat exchangers, towers, vessels and piping; design, manufacturing, repair, and hydro blast cleaning of shell and tube heat exchangers and related equipment; and construction, maintenance, and other support services for customers within the upstream and midstream sectors. The following tables present information about industry segments and geographic areas for the years ended December 31, 2019, 2018, and 2017 (in thousands):
| 2019 |  | 2018 |  | 2017
Revenues from unrelated entities: |  |  |  |  |
United States electrical construction and facilities services | $ | 2,216,600 |  |  | $ | 1,954,323 |  |  | $ | 1,829,567 |
United States mechanical construction and facilities services | 3,340,337 |  |  | 2,962,843 |  |  | 2,880,148 |
United States building services | 2,106,872 |  |  | 1,875,485 |  |  | 1,753,703 |
United States industrial services | 1,087,543 |  |  | 923,109 |  |  | 882,836 |
Total United States operations | 8,751,352 |  |  | 7,715,760 |  |  | 7,346,254 |
United Kingdom building services | 423,259 |  |  | 414,871 |  |  | 340,745 |
Total worldwide operations | $ | 9,174,611 |  |  | $ | 8,130,631 |  |  | $ | 7,686,999 |
Total revenues: |  |  |  |  |
United States electrical construction and facilities services | $ | 2,220,582 |  |  | $ | 1,959,978 |  |  | $ | 1,836,985 |
United States mechanical construction and facilities services | 3,370,960 |  |  | 2,998,918 |  |  | 2,911,033 |
United States building services | 2,182,390 |  |  | 1,942,663 |  |  | 1,812,763 |
United States industrial services | 1,111,264 |  |  | 930,724 |  |  | 885,198 |
Less intersegment revenues | (133,844 | ) |  | (116,523 | ) |  | (99,725 | )
Total United States operations | 8,751,352 |  |  | 7,715,760 |  |  | 7,346,254 |
United Kingdom building services | 423,259 |  |  | 414,871 |  |  | 340,745 |
Total worldwide operations | $ | 9,174,611 |  |  | $ | 8,130,631 |  |  | $ | 7,686,999 |
| 2019 |  | 2018 |  | 2017
Operating income (loss): |  |  |  |  |
United States electrical construction and facilities services | $ | 161,684 |  |  | $ | 139,430 |  |  | $ | 150,001 |
United States mechanical construction and facilities services | 225,040 |  |  | 219,853 |  |  | 192,167 |
United States building services | 114,754 |  |  | 93,827 |  |  | 81,720 |
United States industrial services | 44,340 |  |  | 27,671 |  |  | 39,313 |
Total United States operations | 545,818 |  |  | 480,781 |  |  | 463,201 |
United Kingdom building services | 18,323 |  |  | 15,930 |  |  | 12,905 |
Corporate administration | (101,726 | ) |  | (90,415 | ) |  | (87,808 | )
Restructuring expenses | (1,523 | ) |  | (2,306 | ) |  | (1,577 | )
Impairment loss on goodwill and identifiable intangible assets | — |  |  | (907 | ) |  | (57,819 | )
Total worldwide operations | 460,892 |  |  | 403,083 |  |  | 328,902 |
Other corporate items: |  |  |  |  |
Net periodic pension (cost) income | 1,553 |  |  | 2,743 |  |  | 1,652 |
Interest expense | (13,821 | ) |  | (13,544 | ) |  | (12,770 | )
Interest income | 2,265 |  |  | 2,746 |  |  | 965 |
Income from continuing operations before income taxes | $ | 450,889 |  |  | $ | 395,028 |  |  | $ | 318,749 |
Capital expenditures: |  |  |  |  |  |  |  |
United States electrical construction and facilities services | $ | 5,876 |  |  | $ | 5,993 |  |  | $ | 4,797 |
United States mechanical construction and facilities services | 7,890 |  |  | 7,504 |  |  | 6,665 |
United States building services | 14,291 |  |  | 10,414 |  |  | 10,745 |
United States industrial services | 15,802 |  |  | 18,386 |  |  | 9,696 |
Total United States operations | 43,859 |  |  | 42,297 |  |  | 31,903 |
United Kingdom building services | 3,598 |  |  | 870 |  |  | 2,166 |
Corporate administration | 975 |  |  | 312 |  |  | 615 |
Total worldwide operations | $ | 48,432 |  |  | $ | 43,479 |  |  | $ | 34,684 |
Depreciation and amortization of property, plant and equipment: |  |  |  |  |
United States electrical construction and facilities services | $ | 7,550 |  |  | $ | 6,221 |  |  | $ | 6,545 |
United States mechanical construction and facilities services | 8,764 |  |  | 7,803 |  |  | 7,504 |
United States building services | 12,728 |  |  | 10,324 |  |  | 11,051 |
United States industrial services | 11,154 |  |  | 9,943 |  |  | 10,589 |
Total United States operations | 40,196 |  |  | 34,291 |  |  | 35,689 |
United Kingdom building services | 2,942 |  |  | 3,447 |  |  | 3,371 |
Corporate administration | 807 |  |  | 734 |  |  | 855 |
Total worldwide operations | $ | 43,945 |  |  | $ | 38,472 |  |  | $ | 39,915 |
| 2019 |  | 2018 |  | 2017
Contract assets: |  |  |  |  |  |  |
United States electrical construction and facilities services | $ | 50,813 |  |  | $ | 38,412 |  |  | $ | 35,060 |
United States mechanical construction and facilities services | 61,225 |  |  | 49,302 |  |  | 50,302 |
United States building services | 30,428 |  |  | 33,304 |  |  | 26,028 |
United States industrial services | 9,820 |  |  | 14,117 |  |  | 3,715 |
Total United States operations | 152,286 |  |  | 135,135 |  |  | 115,105 |
United Kingdom building services | 25,544 |  |  | 23,108 |  |  | 7,516 |
Total worldwide operations | $ | 177,830 |  |  | $ | 158,243 |  |  | $ | 122,621 |
Contract liabilities: |  |  |  |  |  |  |
United States electrical construction and facilities services | $ | 173,967 |  |  | $ | 163,951 |  |  | $ | 178,454 |
United States mechanical construction and facilities services | 317,083 |  |  | 280,846 |  |  | 288,699 |
United States building services | 97,588 |  |  | 79,281 |  |  | 48,481 |
United States industrial services | 12,404 |  |  | 12,307 |  |  | 4,615 |
Total United States operations | 601,042 |  |  | 536,385 |  |  | 520,249 |
United Kingdom building services | 22,600 |  |  | 15,905 |  |  | 3,907 |
Total worldwide operations | $ | 623,642 |  |  | $ | 552,290 |  |  | $ | 524,156 |
Long-lived assets: |  |  |  |  |
United States electrical construction and facilities services | $ | 215,780 |  |  | $ | 201,333 |  |  | $ | 180,990 |
United States mechanical construction and facilities services | 530,561 |  |  | 334,628 |  |  | 340,030 |
United States building services | 458,915 |  |  | 436,887 |  |  | 409,718 |
United States industrial services | 615,233 |  |  | 630,340 |  |  | 643,124 |
Total United States operations | 1,820,489 |  |  | 1,603,188 |  |  | 1,573,862 |
United Kingdom building services | 9,622 |  |  | 9,264 |  |  | 11,729 |
Corporate administration | 1,431 |  |  | 1,072 |  |  | 1,494 |
Total worldwide operations | $ | 1,831,542 |  |  | $ | 1,613,524 |  |  | $ | 1,587,085 |
Total assets: |  |  |  |  |
United States electrical construction and facilities services | $ | 834,802 |  |  | $ | 702,112 |  |  | $ | 617,471 |
United States mechanical construction and facilities services | 1,536,325 |  |  | 1,081,005 |  |  | 1,071,164 |
United States building services | 996,664 |  |  | 846,221 |  |  | 764,085 |
United States industrial services | 829,793 |  |  | 864,446 |  |  | 798,975 |
Total United States operations | 4,197,584 |  |  | 3,493,784 |  |  | 3,251,695 |
United Kingdom building services | 181,147 |  |  | 146,379 |  |  | 131,806 |
Corporate administration | 451,627 |  |  | 448,644 |  |  | 582,403 |
Total worldwide operations | $ | 4,830,358 |  |  | $ | 4,088,807 |  |  | $ | 3,965,904 |
During 2018, we recognized losses of $10.0 million on a transportation project within our United States electrical construction and facilities services segment, resulting in part from contract scope issues. During 2017, we recognized $18.1 million of gross profit associated with the recovery of certain contract costs previously disputed on a project completed in 2016 within our United States industrial services segment.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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