Acquisitions - 2015 UK Acquisitions - Additional Information (Detail) - United Kingdom [Member] $ in Millions	Nov. 01, 2015 USD ($) Beds	Oct. 01, 2015 USD ($) Beds	Sep. 01, 2015 USD ($) Beds Facility	Jul. 01, 2015 USD ($) Beds	Jun. 01, 2015 USD ($) Beds Facility	Apr. 01, 2015 USD ($) Beds Facility
Care UK Limited [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $					$ 88.2
Number of beds | Beds					299
Number of facilities acquired | Facility					15
Choice Lifestyles [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $					$ 25.9	$ 37.5
Number of beds | Beds					42	48
Number of facilities acquired | Facility					1	2
Pastoral Care Group [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $						$ 34.2
Number of beds | Beds						65
Number of facilities acquired | Facility						2
Mildmay Oaks [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $						$ 14.9
Number of beds | Beds						67
Cleveland House [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $	$ 10.3
Number of beds | Beds	32
Meadow View [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $		$ 6.8
Number of beds | Beds		28
Health and Social Care Partnerships [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $			$ 26.2
Number of beds | Beds			50
Number of facilities acquired | Facility			2
The Danshell Group [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $			$ 59.8
Number of beds | Beds			73
Number of facilities acquired | Facility			3
Manor Hall [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $			$ 14.0
Number of beds | Beds			26
The Manor Clinic [Member]
Business Acquisition [Line Items]
Business acquisition cash paid | $				$ 5.9
Number of beds | Beds				15