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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets subject to amortization | $ 489,017 | $ 469,748
Accumulated Amortization | (291,461) | (264,674)
Intangible Assets, Net | $ 197,556 | 205,074
Remaining Weighted Average Amortization Period in Years | 10 years 6 months |
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets subject to amortization | $ 247,252 | 236,731
Accumulated Amortization | (106,586) | (90,840)
Intangible Assets, Net | $ 140,666 | 145,891
Remaining Weighted Average Amortization Period in Years | 8 years 10 months 24 days |
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets subject to amortization | $ 134,579 | 130,818
Accumulated Amortization | (132,082) | (126,954)
Intangible Assets, Net | $ 2,497 | 3,864
Remaining Weighted Average Amortization Period in Years | 9 months 18 days |
Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets subject to amortization | $ 55,260 | 51,192
Accumulated Amortization | (12,144) | (9,525)
Intangible Assets, Net | $ 43,116 | 41,667
Remaining Weighted Average Amortization Period in Years | 17 years 9 months 18 days |
Non-compete Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets subject to amortization | $ 29,425 | 28,560
Accumulated Amortization | (25,291) | (23,507)
Intangible Assets, Net | $ 4,134 | 5,053
Remaining Weighted Average Amortization Period in Years | 3 years 2 months 12 days |
Patented Rights and Developed Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets subject to amortization | $ 22,501 | 22,447
Accumulated Amortization | (15,358) | (13,848)
Intangible Assets, Net | $ 7,143 | $ 8,599
Remaining Weighted Average Amortization Period in Years | 4 years 4 months 24 days |

X
- 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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