GENERAL - Additional Information (Detail)										3 Months Ended		9 Months Ended
	Sep. 08, 2020	Jul. 31, 2020 $ / shares	Jun. 19, 2020 USD ($) $ / shares shares	May 27, 2020 USD ($) $ / shares shares	May 05, 2020	Apr. 13, 2020 $ / shares	Apr. 02, 2020 USD ($)	Apr. 01, 2020 USD ($) $ / shares	Jun. 27, 2019	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Property State Segment $ / shares shares	Mar. 31, 2021	Dec. 31, 2020	Apr. 03, 2020 USD ($) $ / shares shares	Mar. 31, 2020	Dec. 31, 2019 USD ($) $ / shares shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Impairment of long-lived assets												$ 0
Net book value of the equipment												90,234,000					$ 103,400,000
Proceeds from issuance of common stock												$ 8,200,000
Issuance of Series A Preferred Stock/Units										$ 8,800,000	$ 57,500,000
Common stock, par value | $ / shares												$ 0.01					$ 0.01
Number of trading days average closing price						30 days
Number of trading days consecutive days						30 days
Minimum average closing stock price as per listing | $ / shares						$ 1.00
Average closing price of common stock per share | $ / shares						$ 0.97
Minimum share price required to regain compliance description						(i) a closing price of at least $1.00 per share and (ii) an average closing price of at least $1.00 per share over the 30-trading day period ending on the last trading day of such month. As required, the Company notified the NYSE, within 10 business days of receipt of the NYSE Notification, of its intent to cure this deficiency in order to avoid immediate suspension and delisting procedures
Minimum closing price per share to regain compliance | $ / shares						$ 1.00
Cash and cash equivalents												$ 44,003,000					$ 34,867,000
Restricted cash												20,600,000					21,900,000
Refundable deposit received for divestitures of property												$ 5,000,000
Divestiture, number of property in non-binding letter | Property												1
Investment Income Contractual Term												60 months
Debt instrument, variable rate												3.75%
Number of reportable segments | Segment												2
Accounts receivable average cancellation rate basis period												5 years
Lease renewal term description												Certain leases provide the Company with the option to renew for additional periods, with renewal terms that can extend the lease term for periods ranging from 1 to 30 years.
Series A Preferred Stock
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Series A Preferred Stock\units (in shares\units) | shares										176
Exchange of Series A Preferred Stock for Common Stock (in shares) | shares										(176)
Minimum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Lease renewal term												1 year
Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Liquid investments purchased with an original maturity												3 months
Product sales, payment term												60 months
Lease renewal term												30 years
Senior Secured Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt covenant, consolidated asset coverage ratio												1.60
Debt instrument redemption price percentage									2.00%
Long-term debt, gross												$ 342,941,000					$ 380,619,000
Senior Secured Notes | Minimum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt instrument redemption price percentage								9.875%
Senior Secured Notes | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt covenant, consolidated asset coverage ratio										1.40		1.40
Debt instrument redemption price percentage								11.50%
Senior Secured Notes | Forecast
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt covenant, consolidated asset coverage ratio														1.40
Senior Secured Notes | Forecast | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt covenant, consolidated asset coverage ratio													1.60	1.40
Senior Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Redeemable convertible preferred units												$ 57,500,000
Preferred units, sold | shares												52,083,333
Long-term debt, interest rate												7.875%
Senior Notes | Private Placement
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Long-term debt, gross												$ 385,000,000
March 31, 2020 | Senior Secured Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Minimum operating cash flow covenant								$ 25,000,000
June 30, 2020 | Senior Secured Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Minimum operating cash flow covenant								35,000,000
September 30, 2020 | Senior Secured Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Minimum operating cash flow covenant								$ 35,000,000
December 31, 2020 | Senior Secured Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Consolidated interest coverage ratio								0.00								1.15
December 31, 2020 | Senior Secured Notes | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Consolidated interest coverage ratio												0.00
March 31, 2021 | Senior Secured Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Consolidated interest coverage ratio								0.75								1.25
March 31, 2021 | Senior Secured Notes | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Consolidated interest coverage ratio												0.75
June 30, 2021 | Senior Secured Notes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Consolidated interest coverage ratio								1.10								1.30
June 30, 2021 | Senior Secured Notes | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Consolidated interest coverage ratio												1.10
Redeemed On Or After June 27, 2021 and Before June 27, 2022 | Senior Secured Notes | Minimum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt instrument redemption price percentage								4.00%
Redeemed On Or After June 27, 2021 and Before June 27, 2022 | Senior Secured Notes | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt instrument redemption price percentage								5.00%
Redeemed On Or After June 27, 2022 and Before June 27, 2023 | Senior Secured Notes | Minimum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt instrument redemption price percentage								2.00%
Redeemed On Or After June 27, 2022 and Before June 27, 2023 | Senior Secured Notes | Maximum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Debt instrument redemption price percentage								3.00%
Axar
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Unsolicited proposal letter date				May 27, 2020
Amended proposal letter date		Jul. 28, 2020
StoneMor Operating LLC
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Ownership percentage subsidiaries by the parent												100.00%					100.00%
C-Corporation Conversion | Partnership and LP Sub
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
General partner ownership interest												100.00%
Compensation Nominating And Governance Committee | Coronavirus Disease2019 Pandemic
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Voluntary base salary reductions, beginning date					Apr. 20, 2020
Voluntary base salary reductions continuation period from beginning date					70 days
Percentage of reduction in quarterly retainer fee					50.00%
Compensation Nominating And Governance Committee | Coronavirus Disease2019 Pandemic | Non-Employee Directors
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of reduction in additional board committee chair fees payable					50.00%
Proposal | Axar
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Share price | $ / shares				$ 0.67
Outstanding common stock ownership percentage	62.00%
Amended Proposal | Axar
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Share price | $ / shares		$ 0.80
Master Services Agreement | Moon Landscaping, Inc.
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Property management and operational services aggregate amount payable							$ 241,000,000
Property management and operational services initial annual cost							$ 49,000,000
Percentage of annual increase In initial cost							2.00%
Net book value of the equipment												$ 5,100,000
Agreement without cause termination equipment credit fee payable							$ 1,000,000
Agreement termination description							Each party has the right to terminate the MSAs at any time on six months’ prior written notice, provided that if the Company terminates the MSAs without cause, it will be obligated to pay Moon an equipment credit fee in the amount of $1.0 million for each year remaining in the term, prorated for the portion of the year in which any such termination occurs.
Supplemental Indenture | Axar | Rights Offering
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Series A Preferred Stock/Units								$ 17,000,000
Share price per common share | $ / shares								$ 0.73
Agreement expiration date								Jul. 24, 2020
Supplemental Indenture | Axar | Rights Offering | Series A Preferred Stock
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Redeemable convertible preferred units								$ 8,800,000
Supplemental Indenture | Axar | Maximum | Rights Offering
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Proceeds from issuance of common stock								8,200,000
Two Thousand Twenty Preferred Purchase Agreement | Axar | Series A Preferred Stock
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Redeemable convertible preferred units															$ 8,800,000
Preferred units, sold | shares															176
Preferred units, par value | $ / shares															$ 0.01
Preferred units, cash price per share | $ / shares															$ 50,000
Common Stock Purchase Agreement | Axar
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Series A Preferred Stock/Units			$ 8,800,000
Share price per common share | $ / shares				$ 0.73
Agreed to sell common stock shares | shares				23,287,672
Common stock, par value | $ / shares				$ 0.01
Authorized repurchase shares, value				$ 17,000,000
Issuance of Series A Preferred Stock\units (in shares\units) | shares			23,287,672
Exchange of Series A Preferred Stock for Common Stock (in shares) | shares			12,054,795									12,054,795
Common Stock Purchase Agreement | Axar | Series A Preferred Stock
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Series A Preferred Stock\units (in shares\units) | shares			176									176
Preferred shares conversion ratio | shares			68,493.15
Common Stock Purchase Agreement | Axar | Rights Offering
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Series A Preferred Stock/Units			$ 8,200,000
Share price per common share | $ / shares			$ 0.73
Issuance of Series A Preferred Stock\units (in shares\units) | shares			11,232,877									11,232,877
Gross proceeds from the contemplated rights offering												$ 17,000,000
Axar Commitment Agreement | Maximum | Rights Offering
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Gross proceeds from the contemplated rights offering								$ 17,000,000
Stonemor GP Holdings LLC | C-Corporation Conversion
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Contribution of common units | shares																	5,099,969
Cemetery
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												30
Cemetery | Consolidated Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												16
Cemetery | Unconsolidated Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												14
US and Puerto Rico | Cemetery
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												318
Number of states | State												27
US and Puerto Rico | Cemetery | Wholly Owned Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												288
US and Puerto Rico | Cemetery | Managed Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												30
US and Puerto Rico | Funeral Home
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												86
Number of states | State												17
US and Puerto Rico | Funeral Home | Cemetery Property
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations | Property												40