Description of Business and Basis of Presentation - Additional Information (Detail)	6 Months Ended
Jun. 30, 2016 State Beds Facilities
Accounting Policies [Abstract]
Number of facilities \| Facilities	591
Number of beds \| Beds	17,800
Number of operating states \| State	39

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