Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 01, 2022	Jun. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0001392091
Entity Registrant Name	Blueknight Energy Partners, L.P.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	001-33503
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-8536826
Entity Address, Address Line One	6060 American Plaza, Suite 600
Entity Address, City or Town	Tulsa
Entity Address, State or Province	OK
Entity Address, Postal Zip Code	74135
City Area Code	918
Local Phone Number	237-4000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 144,500,000
Auditor Name	Ernst & Young LLP
Auditor Location	Tulsa, Oklahoma
Auditor Firm ID	42
ICFR Auditor Attestation Flag	true
Common Unit [Member]
Document Information [Line Items]
Title of 12(b) Security	Common Units representing limited partner interests
Trading Symbol	BKEP
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		41,856,847
Series A Preferred Unit [Member]
Document Information [Line Items]
Title of 12(b) Security	Series A Preferred Units representing limited partner interests
Trading Symbol	BKEPP
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		34,406,683