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Credit Facilities - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Dec. 08, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Mar. 28, 2014
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest expense capitalized |  | $ 0 | $ 132,000 | $ 132,000 |
Jeffries Finance LLC | Senior Secured Revolving Credit Facility |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 10,000,000 |  |  |  |
Letter of credit fronting fee | 0.25% |  |  |  |
Former Revolving Credit Agreement |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 72,500,000
Credit facility maturity date |  | Mar. 28, 2019 |  |  |
Facility termination date |  | Nov. 09, 2016 |  |  |
Line of credit |  | $ 0 | $ 0 |  |
Senior Secured Revolving Credit Facility | Jeffries Finance LLC |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 45,000,000 |  |  |  |
Facility termination date | Dec. 08, 2019 |  |  |  |
Credit facility agreement, term | 3 years |  |  |  |
Default rate, additional to interest rate | 2.00% |  |  |  |
Senior Secured Revolving Credit Facility | Jeffries Finance LLC | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate | 3.00% |  |  |  |
Senior Secured Revolving Credit Facility | Jeffries Finance LLC | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate | 4.00% |  |  |  |
Senior Secured Revolving Credit Facility | Jeffries Finance LLC | ABR |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Default rate, additional to interest rate | 2.00% |  |  |  |
Senior Secured Revolving Credit Facility | Jeffries Finance LLC | ABR | Minimum |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate | 2.00% |  |  |  |
Senior Secured Revolving Credit Facility | Jeffries Finance LLC | ABR | Maximum |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Interest rate | 3.00% |  |  |  |
Jeffries Finance LLC | Senior Secured Revolving Credit Facility |  |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |  |
Percentage of commitment fee | 0.375% |  |  |  |

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- Definition Letter of credit fronting fee. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility default rate in addition to interest rate. + References No definition available. + Details
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Namespace Prefix: | snd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- 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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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
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- Details
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- Details
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- Details
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