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Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Commitments and Contingencies - University House Communities Group, Inc., Indemnity Claims (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 14, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Losses from discontinued operations related to claims		$ 25,500	$ 0	$ 4,500
Settled Litigation \| University House Communities Group, Inc
Loss Contingencies [Line Items]
Final settlement for claims awarded to other party	$ 30,000