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Equipment Lease Obligations - Schedule of Future Minimum Lease Payments for Equipment Lease Obligations (Parenthetical) (Detail) | Sep. 30, 2017
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Minimum |
Capital Leased Assets [Line Items] |
Capital leases future minimum payments interest rate | 0.00%
Maximum |
Capital Leased Assets [Line Items] |
Capital leases future minimum payments interest rate | 4.95%

X
- Definition Capital leases future minimum payments interest rate. + References No definition available. + Details
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Namespace Prefix: | snd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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
Name: | us-gaap_CapitalLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |