Name:	ston_AmountDistributedOutOfMerchandiseTrust
Namespace Prefix:	ston_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This item represents the pretax change in net unrealized holding gain (loss) on available-for-sale securities held within the trust during the period.

No definition available.

Name:	ston_AvailableForSaleSecuritiesUnrealizedGainsLosses
Namespace Prefix:	ston_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Capital Gain (Loss) Distribution

No definition available.

Name:	ston_CapitalGainLossDistribution
Namespace Prefix:	ston_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The amount deposited into the merchandise trust for the period. Pursuant to state law, a portion of the proceeds from pre-need sales of merchandise and services is placed in the trust until the requirements for releasing the principal are met, which is generally the delivery of merchandise or performance of services.

No definition available.

Name:	ston_DepositIntoMerchandiseTrust
Namespace Prefix:	ston_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The aggregate fair value of investments placed into merchandise trusts. Pursuant to state law, a portion of the proceeds from pre-need sales of merchandise and services is placed in the trust until the requirements for releasing the principal are met, which is generally the delivery of merchandise or performance of services. All investment earnings related to merchandise trust assets are deferred until the associated merchandise is delivered or the services are performed.

No definition available.

Name:	ston_MerchandiseTrusts
Namespace Prefix:	ston_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Merchandise trusts including assets held for sale.

No definition available.

Name:	ston_MerchandiseTrustsIncludingAssetsHeldForSale
Namespace Prefix:	ston_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Tax expense on transactions occurring within the merchandise trust during the period.

No definition available.

Name:	ston_TaxExpenseOnTransactionsOccurringWithinMerchandiseTrust
Namespace Prefix:	ston_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI https://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562

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

Cash received for dividends and interest on the entity's equity and debt investments during the current period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 16
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3337-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585

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

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.

No definition available.

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

Fees charged annually for the professional services of a trustee, usually quoted as a percentage of the funds being managed. The fee for appointing an offshore Trustee is included in the trust price.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227