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Goodwill and Other Intangible Assets - Schedule of Carrying Value and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 10,272 | $ 7,933
Accumulated Amortization | 4,065 | 3,247
Customer list |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,757 | 7,393
Accumulated Amortization | 3,664 | 2,880
Non-Compete Agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,245 | 270
Accumulated Amortization | 202 | 175
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 270 | 270
Accumulated Amortization | $ 199 | $ 192

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