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Commitments and Contingencies - Schedule of Future Minimum Annual Commitments Under Non-Lease Contracts (Detail) $ in Thousands | Mar. 31, 2019 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
2019 | $ 833
non-lease future commitment yr2 | 2,275
non-lease future commitment yr3 | 2,275
non-lease future commitment yr4 | 2,275
non-lease future commitment yr5 | 2,275
non-lease future commitment after 5 | 31,850
non-lease future commitment total | $ 41,783

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- Definition non-lease future commitment + References No definition available. + Details
Name: | snd_Nonleasefuturecommitment
Namespace Prefix: | snd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition non-lease future commitment after 5 + References No definition available. + Details
Name: | snd_Nonleasefuturecommitmentafter5
Namespace Prefix: | snd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition non-lease future commitment total + References No definition available. + Details
Name: | snd_Nonleasefuturecommitmenttotal
Namespace Prefix: | snd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition non-lease future commitment yr2 + References No definition available. + Details
Name: | snd_Nonleasefuturecommitmentyr2
Namespace Prefix: | snd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition non-lease future commitment yr3 + References No definition available. + Details
Name: | snd_Nonleasefuturecommitmentyr3
Namespace Prefix: | snd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition non-lease future commitment yr4 + References No definition available. + Details
Name: | snd_Nonleasefuturecommitmentyr4
Namespace Prefix: | snd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition non-lease future commitment yr5 + References No definition available. + Details
Name: | snd_Nonleasefuturecommitmentyr5
Namespace Prefix: | snd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration