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401(k) Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Sale Of Subsidiary [Abstract]
Defined contribution plan, employer discretionary contribution amount	$ 181	$ 121

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- Definition

Schedule Of Sale Of Subsidiary [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	snd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration