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Intangible Assets by Major Class (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Weighted Average Useful Life in Years | 13 years 4 months 24 days |
Finite lived intangible assets, Gross Carrying Amount | $ 124,530 | $ 139,408
Intangible assets, Accumulated Amortization | 78,010 | 81,073
Finite lived intangible assets, Net Carrying Amount | 46,520 | 58,335
Intangible assets, Gross Carrying Amount | 130,130 | 145,008
Intangible assets, Net Carrying Amount | $ 52,120 | 63,935
Customer Relationships |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Weighted Average Useful Life in Years | 13 years 7 months 6 days |
Finite lived intangible assets, Gross Carrying Amount | $ 119,736 | 128,512
Intangible assets, Accumulated Amortization | 75,212 | 72,941
Finite lived intangible assets, Net Carrying Amount | $ 44,524 | 55,571
Non-Competition agreements |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Weighted Average Useful Life in Years | 6 years 6 months |
Finite lived intangible assets, Gross Carrying Amount | $ 1,263 | 7,263
Intangible assets, Accumulated Amortization | 1,246 | 7,052
Finite lived intangible assets, Net Carrying Amount | $ 17 | 211
Computer Software, Intangible Asset |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Weighted Average Useful Life in Years | 9 years 3 months 18 days |
Finite lived intangible assets, Gross Carrying Amount | $ 3,171 | 3,273
Intangible assets, Accumulated Amortization | 1,292 | 940
Finite lived intangible assets, Net Carrying Amount | $ 1,879 | 2,333
Trade Names |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite lived intangible assets, Weighted Average Useful Life in Years | 3 years |
Finite lived intangible assets, Gross Carrying Amount | $ 360 | 360
Intangible assets, Accumulated Amortization | 260 | 140
Finite lived intangible assets, Net Carrying Amount | $ 100 | 220
Indefinite-lived intangible assets, Useful Life | Indefinite |
Indefinite-lived intangible assets, Gross Carrying Amount | $ 5,600 | $ 5,600

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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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