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Business Acquisitions, Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Sep. 30, 2018 | Dec. 31, 2018
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 1,303,400 | $ 1,301,800
Accumulated Amortization | (983,500) | (1,005,100)
Intangible Assets, Net | 319,892 | 296,711
Backlog and customer relationships |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | 1,285,100 | 1,283,500
Accumulated Amortization | (966,000) | (987,400)
Intangible Assets, Net | $ 319,100 | 296,100
Backlog and customer relationships | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 1 year |
Backlog and customer relationships | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 11 years |
Trademark / tradename |  |
Identifiable intangible assets with finite useful lives |  |
Gross Amount | $ 18,300 | 18,300
Accumulated Amortization | (17,500) | (17,700)
Intangible Assets, Net | $ 800 | $ 600
Trademark / tradename | Minimum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 3 months 18 days |
Trademark / tradename | Maximum |  |
Identifiable intangible assets with finite useful lives |  |
Amortization Period | 2 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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