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Cover Page - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Mar. 10, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-33810    
Entity Registrant Name American Public Education, Inc.    
Entity Incorporation, State Country Name DE    
Entity Tax Identification Number 01-0724376    
Entity Address, Address Line One 111 West Congress Street,    
Entity Address, City or Town Charles Town,    
Entity Address, State or Province WV    
Entity Address, Postal Zip Code 25414    
City Area Code 304    
Local Phone Number 724-3700    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol APEI    
Security Exchange Name NASDAQ    
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 false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 302
Entity Common Stock, Shares Outstanding   19,030,770  
Documents Incorporated by Reference Certain portions of the registrant’s Definitive Proxy Statement for its 2023 Annual Meeting of Stockholders (which is expected to be filed with the Commission within 120 days after the end of the registrant’s 2022 fiscal year) are incorporated by reference into Part III of this Annual Report.    
Entity Central Index Key 0001201792    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false