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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 598,686 | $ 484,336
Accumulated Amortization | (335,507) | (297,313)
Intangible Assets, Net | $ 263,179 | 187,023
Remaining Weighted Average Amortization Period in Years | 9 years 1 month 6 days |
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 327,334 | 244,329
Accumulated Amortization | (137,333) | (110,640)
Intangible Assets, Net | $ 190,001 | 133,689
Remaining Weighted Average Amortization Period in Years | 7 years 3 months 24 days |
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 136,266 | 133,592
Accumulated Amortization | (135,847) | (132,441)
Intangible Assets, Net | $ 419 | 1,151
Remaining Weighted Average Amortization Period in Years | 1 year 1 month 3 days |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 74,797 | 54,723
Accumulated Amortization | (17,057) | (12,855)
Intangible Assets, Net | $ 57,740 | 41,868
Remaining Weighted Average Amortization Period in Years | 16 years 2 months 12 days |
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 37,760 | 29,212
Accumulated Amortization | (27,659) | (25,546)
Intangible Assets, Net | $ 10,101 | 3,666
Remaining Weighted Average Amortization Period in Years | 3 years 10 months 24 days |
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 22,529 | 22,480
Accumulated Amortization | (17,611) | (15,831)
Intangible Assets, Net | $ 4,918 | $ 6,649
Remaining Weighted Average Amortization Period in Years | 3 years 4 months 24 days |

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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 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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