Segment Information - Summary of Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Revenue	$ 67,888	$ 72,992	$ 211,889	$ 220,757
Depreciation and amortization:
Total Depreciation and amortization	3,764	4,289	11,758	13,158
(Loss) income from operations before interest income and income taxes:
Total (Loss) income from operations before interest income and income taxes	(2,913)	6,884	4,147	21,094
Interest income, net:
Interest income, net	1,019	774	3,207	1,928
Income tax (benefit) expense:
Total Income tax (benefit) expense	(239)	1,848	1,596	5,993
Capital expenditures:
Total Capital expenditures	1,194	1,549	4,151	5,349
Intersegment elimination
Revenue:
Revenue	(25)	0	(81)	0
(Loss) income from operations before interest income and income taxes:
Total (Loss) income from operations before interest income and income taxes	(2)	0	3	0
American Public Education Segment
Depreciation and amortization:
Total Depreciation and amortization	3,525	3,970	10,995	12,126
Interest income, net:
Interest income, net	1,006	759	3,176	1,889
Income tax (benefit) expense:
Total Income tax (benefit) expense	1,368	1,633	5,166	5,320
Capital expenditures:
Total Capital expenditures	1,034	1,396	3,608	5,026
American Public Education Segment | Operating Segments
Revenue:
Revenue	61,217	63,849	190,386	193,209
(Loss) income from operations before interest income and income taxes:
Total (Loss) income from operations before interest income and income taxes	247	6,233	14,358	18,532
Hondros College of Nursing Segment
Depreciation and amortization:
Total Depreciation and amortization	239	319	763	1,032
Interest income, net:
Interest income, net	13	15	31	39
Income tax (benefit) expense:
Total Income tax (benefit) expense	(1,607)	215	(3,570)	673
Capital expenditures:
Total Capital expenditures	160	153	543	323
Hondros College of Nursing Segment | Operating Segments
Revenue:
Revenue	6,696	9,143	21,584	27,548
(Loss) income from operations before interest income and income taxes:
Total (Loss) income from operations before interest income and income taxes	$ (3,158)	$ 651	$ (10,214)	$ 2,562