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Goodwill and Other Intangible Assets - Intangible Assets by Major Class (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Amortized intangible assets, Weighted Average Useful Life in Years | 13 years 7 months 6 days |
Amortized intangible assets, Gross Carrying Amount | $ 120,456 | $ 124,530
Amortized intangible assets, Accumulated Amortization | 81,906 | 78,010
Amortized intangible assets, Net Carrying Amount | 38,550 | 46,520
Intangible assets, Gross Carrying Amount | 126,056 | 130,130
Intangible assets, Net Carrying Amount | 44,150 | 52,120
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Unamortized intangible assets, Gross Carrying Amount | $ 5,600 | 5,600
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortized intangible assets, Weighted Average Useful Life in Years | 13 years 8 months 12 days |
Amortized intangible assets, Gross Carrying Amount | $ 117,192 | 119,736
Amortized intangible assets, Accumulated Amortization | 80,523 | 75,212
Amortized intangible assets, Net Carrying Amount | 36,669 | 44,524
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross Carrying Amount | 0 | 1,263
Amortized intangible assets, Accumulated Amortization | 0 | 1,246
Amortized intangible assets, Net Carrying Amount | $ 0 | 17
Acquired software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortized intangible assets, Weighted Average Useful Life in Years | 9 years 9 months 18 days |
Amortized intangible assets, Gross Carrying Amount | $ 3,264 | 3,171
Amortized intangible assets, Accumulated Amortization | 1,383 | 1,292
Amortized intangible assets, Net Carrying Amount | 1,881 | 1,879
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortized intangible assets, Gross Carrying Amount | 0 | 360
Amortized intangible assets, Accumulated Amortization | 0 | 260
Amortized intangible assets, Net Carrying Amount | $ 0 | $ 100

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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 of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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