Segment Information - Summary of Consolidated Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Total Assets	$ 771,410	$ 725,608
Corporate and Other
Assets:
Total Assets	157,961	117,447
APUS Segment | Operating Segments
Assets:
Total Assets	136,573	126,926
RU Segment | Operating Segments
Assets:
Total Assets	426,073	429,299
HCN Segment | Operating Segments
Assets:
Total Assets	$ 50,803	$ 51,936