GENERAL - Additional Information (Detail)			3 Months Ended	12 Months Ended
	May 11, 2021 USD ($)	Jun. 19, 2020 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) Property State Segment	Dec. 31, 2020 USD ($)	Apr. 03, 2020 USD ($) $ / shares shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cash and cash equivalents | $			$ 48,696,000	$ 39,244,000
Restricted cash | $			$ 16,600,000	20,800,000
Investment income, contractual term			60 months
Debt instrument, variable rate			375.00%
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.
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
Minimum
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Lease renewal term			1 year
Axar | Common Stock Purchase Agreement
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Exchange of Series A Preferred Stock for Common Stock (in shares) | shares		12,054,795
Axar | Common Stock Purchase Agreement | Rights Offering
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Series A Preferred Stock\units (in shares\units) | shares		11,232,877
Share price | $ / shares		$ 0.73
Issuance of Series A Preferred Stock/Units | $		$ 8,200,000
Series A Preferred Stock | Axar
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Preferred units, sold | shares					176
Preferred units, cash price per share | $ / shares					$ 50,000
Preferred unit, aggregate purchase price | $					$ 8,800,000
Series A Preferred Stock | Axar | Common Stock Purchase Agreement
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Series A Preferred Stock\units (in shares\units) | shares		176
Coronavirus Disease2019 Pandemic
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cost related to COVID-19 safety protocols | $			$ 57,000	$ 1,000,000
8.500% Senior Secured Notes due 2029 | Subsequent Event
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Long-term debt, principal amount | $	$ 400,000,000
Long-term debt, interest rate	8.50%
Gross proceeds from the sale of the senior secured notes | $	$ 389,900,000
9.875% notes, due 2024
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Long-term debt, interest rate			9.875%
11.500% notes, due 2024
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Long-term debt, interest rate			11.50%
StoneMor Operating LLC
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Ownership percentage subsidiaries by the parent			100.00%	100.00%
Cemetery
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			30
Cemetery | Consolidated Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			16
Cemetery | Unconsolidated Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			14
US and Puerto Rico | Cemetery
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			313
Number of states | State			26
US and Puerto Rico | Cemetery | Wholly Owned Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			283
US and Puerto Rico | Cemetery | Managed Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			30
US and Puerto Rico | Funeral Home
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			80
Number of states | State			16
US and Puerto Rico | Funeral Home | Cemetery Property
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of operating locations			37