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Goodwill and Intangible Assets - Classes of Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 85,094 | $ 88,094
Accumulated Amortization | 12,343 | 13,929
Net | 72,751 | 74,165
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 85,068 | 85,068
Accumulated Amortization | 12,336 | 10,925
Net | $ 72,732 | $ 74,143
Non-Compete Agreement |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period | 36 months | 36 months
Cost | $ 26 | $ 26
Accumulated Amortization | 7 | 4
Net | $ 19 | $ 22
Trade Name |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period |  | 24 months
Cost |  | $ 3,000
Accumulated Amortization |  | 3,000
Net |  | $ 0
Minimum | Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period | 156 months | 156 months
Maximum | Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortization Period | 180 months | 180 months

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + 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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