Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 10, 2020
Document Information Line Items
Entity Registrant Name	SENTINEL ENERGY SERVICES INC.
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0001709768
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	true
Entity Ex Transition Period	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-38271
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1370747
Entity Address, Address Line One	700 Louisiana Street
Entity Address, Address Line Two	Suite 2700
Entity Address, City or Town	Houston
Entity Address, Address Line Three	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77002
City Area Code	(281)
Local Phone Number	407-0686
Entity Interactive Data Current	Yes
Common Class A
Document Information Line Items
Entity Common Stock, Shares Outstanding		523,642
Common Class B
Document Information Line Items
Entity Common Stock, Shares Outstanding		862,500