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Asset Acquisition (Details) $ in Thousands	Mar. 15, 2018 USD ($)
Van Hook Crude LLC
Business Acquisition [Line Items]
Acquisition of assets, consideration	$ 15,549

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

+ Details

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Balance Type:	credit
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X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=snd_VanHookCrudeLLCMember
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Balance Type:
Period Type: