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Operations by Business Segment and Geographic Area - Depreciation and Amortization of Fixed Assets and Capital Expenditures (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Depreciation and amortization of fixed assets |  |  |
Total depreciation and amortization of fixed assets | $ 206,113 | $ 211,095 | $ 188,700
Capital expenditures |  |  |
Total capital expenditures | 283,107 | 235,904 | 240,220
Corporate and other |  |  |
Depreciation and amortization of fixed assets |  |  |
Total depreciation and amortization of fixed assets | 61,000 | 65,400 | 68,100
Capital expenditures |  |  |
Total capital expenditures | 64,100 | 78,500 | 71,300
Mining, Industrial, Infrastructure & Power | Reportable segments |  |  |
Depreciation and amortization of fixed assets |  |  |
Total depreciation and amortization of fixed assets | 4,700 | 3,900 | 4,000
Capital expenditures |  |  |
Total capital expenditures | 27,700 | 2,200 | 6,100
Government Segment | Reportable segments |  |  |
Depreciation and amortization of fixed assets |  |  |
Total depreciation and amortization of fixed assets | 2,800 | 2,300 | 3,200
Capital expenditures |  |  |
Total capital expenditures | 4,200 | 2,100 | 3,900
Diversified Services | Reportable segments |  |  |
Depreciation and amortization of fixed assets |  |  |
Total depreciation and amortization of fixed assets | 137,600 | 139,500 | 113,400
Capital expenditures |  |  |
Total capital expenditures | $ 187,100 | $ 153,100 | $ 158,900

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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