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Goodwill and Intangible Assets - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Impairment of goodwill | $ 0 | $ 0 | $ 0
Goodwill | $ 58,332,000 | 56,135,000 | 57,976,000
Minimum |  |  |
Goodwill [Line Items] |  |  |
Percent of goodwill fair value that exceeds carrying value | 20.00% |  |
Intangible assets amortization period | 1 year |  |
Minimum | Customer contracts |  |  |
Goodwill [Line Items] |  |  |
Intangible assets amortization period | 1 year |  |
Minimum | Customer relationships, noncompete agreements, technology and trade names |  |  |
Goodwill [Line Items] |  |  |
Intangible assets amortization period | 4 years |  |
Maximum |  |  |
Goodwill [Line Items] |  |  |
Intangible assets amortization period | 15 years |  |
Maximum | Customer contracts |  |  |
Goodwill [Line Items] |  |  |
Intangible assets amortization period | 8 years |  |
Maximum | Customer relationships, noncompete agreements, technology and trade names |  |  |
Goodwill [Line Items] |  |  |
Intangible assets amortization period | 15 years |  |
Canada |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 3,217,000 | 3,494,000 | 3,262,000
U.S. Regions |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 26,370,000 | $ 24,759,000 | $ 24,759,000

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- Definition Percent of Goodwill Fair Value that Exceeds Carrying Val + References No definition available. + Details
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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 Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266 + Details
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