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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue From Contracts With Customers [Line Items] |  |  |
Capitalized commission fees | $ 0.2 |  |
(ASC) topic 606 | Effect of Revenue Guidance Adoption [Member] |  |  |
Revenue From Contracts With Customers [Line Items] |  |  |
Effective change on revenue and transportation costs |  | $ 3.0 | $ 2.8
Selling, General and Administrative Expenses [Member] |  |  |
Revenue From Contracts With Customers [Line Items] |  |  |
Amortization of capitalized commission fees | $ 0.1 |  |

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- Definition Revenue from contracts with customers. + References No definition available. + Details
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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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