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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	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

Effect of change on revenue from contract with customer and transportation costs.

+ References

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Revenue from contracts with customers.

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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

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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

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