Name:	soi_ThresholdPeriodPastDueTradeAccountsReceivable
Namespace Prefix:	soi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount of allowance for credit loss on accounts receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of direct write-downs of accounts receivable charged against the allowance.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- References

No definition available.

Name:	us-gaap_ReceivablesAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

No definition available.