Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Purchase Option One
Commitment And Contingencies [Line Items]
Number of tenants with purchase options	1
Purchase Option One | Exercisable Period One
Commitment And Contingencies [Line Items]
Number of properties with purchase options	5
Purchase Option One | Exercisable Period One | Minimum
Commitment And Contingencies [Line Items]
Purchase option, exercisable period	Jan. 01, 2017
Purchase Option One | Exercisable Period Two
Commitment And Contingencies [Line Items]
Number of properties with purchase options	2
Purchase Option One | Exercisable Period Two | Minimum
Commitment And Contingencies [Line Items]
Purchase option, exercisable period	Jan. 01, 2019
Purchase Option One | Exercisable Period Three
Commitment And Contingencies [Line Items]
Number of properties with purchase options	5
Purchase Option One | Exercisable Period Three | Minimum
Commitment And Contingencies [Line Items]
Purchase option, exercisable period	Jan. 01, 2022
Purchase Option Two
Commitment And Contingencies [Line Items]
Number of tenants with purchase options	4
Number of properties with purchase options	5
Purchase Option Two | Exercisable at Predetermined Purchase Price
Commitment And Contingencies [Line Items]
Number of properties with purchase options	2
Purchase Option Two | Exercisable at Purchase Price to be Determined at Future Date
Commitment And Contingencies [Line Items]
Number of properties with purchase options	3
2012 Activity Not Previously Reserved
Commitment And Contingencies [Line Items]
Number of operators with contractual arrangements	3
Number of facilities with contractual arrangements	6
Obligation for fees	$ 2.6
Obligation paid	2.1
Accrued as a component of other liabilities	$ 0.5