Description of Business and Basis of Presentation - Additional Information (Detail)	9 Months Ended
Sep. 30, 2020 Facility Bed State
Accounting Policies [Abstract]
Number of facilities \| Facility	582
Number of beds \| Bed	18,300
Number of operating states \| State	40

The number of states the entity operates in as of the balance sheet date.

No definition available.

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant