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Operating Information by Segment and Geographic Area - Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
TOTAL REVENUE | $ 3,937,707 | $ 3,842,235 | $ 10,622,201 | $ 11,268,305
Energy & Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
TOTAL REVENUE | 1,611,600 | 1,902,300 | 4,485,200 | 5,859,800
Mining & Industrial |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
TOTAL REVENUE | 1,374,000 | 973,300 | 3,703,600 | 2,377,400
Infrastructure & Power |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
TOTAL REVENUE | 392,500 | 412,300 | 951,800 | 1,250,600
Diversified Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
TOTAL REVENUE | 521,700 | 526,300 | 1,525,000 | 1,706,900
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
TOTAL REVENUE | 37,900 | 28,000 | (43,400) | 73,600
Intercompany | Diversified Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
TOTAL REVENUE | $ 81,000 | $ 73,000 | $ 253,000 | $ 257,000

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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