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Goodwill and Other Intangible Assets - Intangible Assets by Major Class (Detail) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Amortized intangible assets, Weighted Average Useful Life in Years | 14 years 2 months 12 days |
Amortized intangible assets, Gross Carrying Amount | $ 102,187 | $ 120,456
Amortized intangible assets, Accumulated Amortization | 72,654 | 81,906
Amortized intangible assets, Net Carrying Amount | 29,533 | 38,550
Intangible assets, Gross Carrying Amount | 107,287 | 126,056
Intangible assets, Net Carrying Amount | 34,633 | 44,150
Trade names (1) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Unamortized intangible assets, Gross Carrying Amount | $ 5,100 | 5,600
Customer relationships (1) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortized intangible assets, Weighted Average Useful Life in Years | 14 years 3 months 18 days |
Amortized intangible assets, Gross Carrying Amount | $ 99,080 | 117,192
Amortized intangible assets, Accumulated Amortization | 71,036 | 80,523
Amortized intangible assets, Net Carrying Amount | $ 28,044 | 36,669
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 | $ 3,107 | 3,264
Amortized intangible assets, Accumulated Amortization | 1,618 | 1,383
Amortized intangible assets, Net Carrying Amount | $ 1,489 | $ 1,881

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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://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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