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Segment Information | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Segment Information | SEGMENT INFORMATION 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 process, food process 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 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, including those for refineries and petrochemical plants, including 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; refinery turnaround planning and engineering services; specialty welding services; overhaul and maintenance of critical process units in refineries and petrochemical plants; and specialty technical services for refineries and petrochemical plants. The following tables present information about industry segments and geographic areas for the years ended December 31, 2017, 2016 and 2015 (in thousands):
| 2017 |  | 2016 |  | 2015
Revenues from unrelated entities: |  |  |  |  |
United States electrical construction and facilities services | $ | 1,829,567 |  |  | $ | 1,704,403 |  |  | $ | 1,367,142 |
United States mechanical construction and facilities services | 2,963,815 |  |  | 2,643,321 |  |  | 2,293,038 |
United States building services | 1,753,703 |  |  | 1,810,229 |  |  | 1,758,984 |
United States industrial services | 799,169 |  |  | 1,067,315 |  |  | 922,085 |
Total United States operations | 7,346,254 |  |  | 7,225,268 |  |  | 6,341,249 |
United Kingdom building services | 340,745 |  |  | 326,256 |  |  | 377,477 |
Total worldwide operations | $ | 7,686,999 |  |  | $ | 7,551,524 |  |  | $ | 6,718,726 |
Total revenues: |  |  |  |  |
United States electrical construction and facilities services | $ | 1,836,985 |  |  | $ | 1,728,920 |  |  | $ | 1,378,620 |
United States mechanical construction and facilities services | 2,994,700 |  |  | 2,662,100 |  |  | 2,306,958 |
United States building services | 1,812,763 |  |  | 1,864,824 |  |  | 1,813,811 |
United States industrial services | 801,531 |  |  | 1,068,662 |  |  | 923,648 |
Less intersegment revenues | (99,725 | ) |  | (99,238 | ) |  | (81,788 | )
Total United States operations | 7,346,254 |  |  | 7,225,268 |  |  | 6,341,249 |
United Kingdom building services | 340,745 |  |  | 326,256 |  |  | 377,477 |
Total worldwide operations | $ | 7,686,999 |  |  | $ | 7,551,524 |  |  | $ | 6,718,726 |
Operating income (loss): |  |  |  |  |
United States electrical construction and facilities services | $ | 150,001 |  |  | $ | 101,761 |  |  | $ | 82,225 |
United States mechanical construction and facilities services | 212,320 |  |  | 132,667 |  |  | 138,444 |
United States building services | 81,504 |  |  | 76,845 |  |  | 70,776 |
United States industrial services | 19,084 |  |  | 77,845 |  |  | 56,469 |
Total United States operations | 462,909 |  |  | 389,118 |  |  | 347,914 |
United Kingdom building services | 14,849 |  |  | 11,946 |  |  | 11,634 |
Corporate administration | (87,808 | ) |  | (88,740 | ) |  | (71,642 | )
Restructuring expenses | (1,577 | ) |  | (1,438 | ) |  | (824 | )
Impairment loss on goodwill and identifiable intangible assets | (57,819 | ) |  | (2,428 | ) |  | — |
Total worldwide operations | 330,554 |  |  | 308,458 |  |  | 287,082 |
Other corporate items: |  |  |  |  |
Interest expense | (12,770 | ) |  | (12,627 | ) |  | (8,932 | )
Interest income | 965 |  |  | 663 |  |  | 673 |
Income from continuing operations before income taxes | $ | 318,749 |  |  | $ | 296,494 |  |  | $ | 278,823 |
| 2017 |  | 2016 |  | 2015
Capital expenditures: |  |  |  |  |  |  |  |
United States electrical construction and facilities services | $ | 4,797 |  |  | $ | 5,294 |  |  | $ | 6,063 |
United States mechanical construction and facilities services | 6,778 |  |  | 7,672 |  |  | 5,312 |
United States building services | 10,745 |  |  | 11,080 |  |  | 7,266 |
United States industrial services | 9,583 |  |  | 10,065 |  |  | 11,073 |
Total United States operations | 31,903 |  |  | 34,111 |  |  | 29,714 |
United Kingdom building services | 2,166 |  |  | 4,523 |  |  | 5,298 |
Corporate administration | 615 |  |  | 1,014 |  |  | 448 |
Total worldwide operations | $ | 34,684 |  |  | $ | 39,648 |  |  | $ | 35,460 |
Depreciation and amortization of Property, plant and equipment: |  |  |  |  |
United States electrical construction and facilities services | $ | 6,545 |  |  | $ | 6,318 |  |  | $ | 4,676 |
United States mechanical construction and facilities services | 7,819 |  |  | 7,544 |  |  | 7,562 |
United States building services | 11,051 |  |  | 10,241 |  |  | 9,896 |
United States industrial services | 10,274 |  |  | 10,394 |  |  | 9,629 |
Total United States operations | 35,689 |  |  | 34,497 |  |  | 31,763 |
United Kingdom building services | 3,371 |  |  | 3,560 |  |  | 3,603 |
Corporate administration | 855 |  |  | 824 |  |  | 928 |
Total worldwide operations | $ | 39,915 |  |  | $ | 38,881 |  |  | $ | 36,294 |
Costs and estimated earnings in excess of billings on uncompleted contracts: |  |  |  |  |  |  |
United States electrical construction and facilities services | $ | 35,060 |  |  | $ | 46,193 |  |  | $ | 39,116 |
United States mechanical construction and facilities services | 52,381 |  |  | 46,703 |  |  | 45,787 |
United States building services | 26,028 |  |  | 28,084 |  |  | 21,392 |
United States industrial services | 1,636 |  |  | 2,572 |  |  | 3,358 |
Total United States operations | 115,105 |  |  | 123,552 |  |  | 109,653 |
United Kingdom building services | 7,516 |  |  | 7,145 |  |  | 8,081 |
Total worldwide operations | $ | 122,621 |  |  | $ | 130,697 |  |  | $ | 117,734 |
Billings in excess of costs and estimated earnings on uncompleted contracts: |  |  |  |  |  |  |
United States electrical construction and facilities services | $ | 178,454 |  |  | $ | 163,794 |  |  | $ | 139,857 |
United States mechanical construction and facilities services | 290,216 |  |  | 271,811 |  |  | 237,623 |
United States building services | 48,481 |  |  | 50,546 |  |  | 45,316 |
United States industrial services | 3,098 |  |  | 1,823 |  |  | 1,170 |
Total United States operations | 520,249 |  |  | 487,974 |  |  | 423,966 |
United Kingdom building services | 3,907 |  |  | 1,268 |  |  | 5,269 |
Total worldwide operations | $ | 524,156 |  |  | $ | 489,242 |  |  | $ | 429,235 |
| 2017 |  | 2016 |  | 2015
Long-lived assets: |  |  |  |  |
United States electrical construction and facilities services | $ | 180,990 |  |  | $ | 183,632 |  |  | $ | 20,139 |
United States mechanical construction and facilities services | 352,970 |  |  | 287,744 |  |  | 294,969 |
United States building services | 409,718 |  |  | 401,154 |  |  | 380,031 |
United States industrial services | 630,184 |  |  | 709,267 |  |  | 730,413 |
Total United States operations | 1,573,862 |  |  | 1,581,797 |  |  | 1,425,552 |
United Kingdom building services | 11,729 |  |  | 11,446 |  |  | 10,927 |
Corporate administration | 1,494 |  |  | 1,734 |  |  | 1,543 |
Total worldwide operations | $ | 1,587,085 |  |  | $ | 1,594,977 |  |  | $ | 1,438,022 |
Total assets: |  |  |  |  |
United States electrical construction and facilities services | $ | 617,471 |  |  | $ | 631,581 |  |  | $ | 372,525 |
United States mechanical construction and facilities services | 1,097,240 |  |  | 954,633 |  |  | 888,322 |
United States building services | 764,085 |  |  | 753,434 |  |  | 727,697 |
United States industrial services | 772,899 |  |  | 850,434 |  |  | 883,338 |
Total United States operations | 3,251,695 |  |  | 3,190,082 |  |  | 2,871,882 |
United Kingdom building services | 131,806 |  |  | 105,081 |  |  | 133,782 |
Corporate administration | 582,403 |  |  | 557,275 |  |  | 501,042 |
Total worldwide operations | $ | 3,965,904 |  |  | $ | 3,852,438 |  |  | $ | 3,506,706 |
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 the prior year. During 2016, we incurred $19.4 million of losses on a transportation project within our United States electrical construction and facilities services segment as a result of productivity issues attributable to unfavorable job-site conditions. In addition, within the United States mechanical construction and facilities services segment, we incurred $18.3 million of losses on a project at a process facility as a result of a contract dispute with our customer and $9.6 million of losses on an institutional project due to project delays and unfavorable job-site conditions. The results of our United States mechanical construction and facilities services segment included revenues of $12.1 million recognized during 2015 as a result of the settlement of a claim on an institutional project located in the Southeastern region of the United States.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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