Rental Property Activity (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Real Estate Properties [Line Items]
Property Acquired Purchase Price	$ 368,870	$ 38,076
Total Purchase Price of acquisition	383,268
January | SNF/ALF/ILF | MINNESOTA
Real Estate Properties [Line Items]
Real Estate property type	SNF/ALF/ILF
Property Acquired Purchase Price	40,000
January | SNF | Texas
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	15,920
March | SNF | Iowa
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	13,500
March | SNF | Kentucky
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	35,000
April | SNF | Texas
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	53,700
April | SNF | Florida
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	6,000
May | SNF | Texas
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	3,600
May | SNF | California
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	13,350
June | SNF | Kentucky
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	6,000
July | Massachusetts
Real Estate Properties [Line Items]
Real Estate property type	Land Held for Development
Property Acquired Purchase Price	12,288
July | SNF | Missouri
Real Estate Properties [Line Items]
Real Estate property type	SNF
Property Acquired Purchase Price	16,200
July | ALF | Massachusetts
Real Estate Properties [Line Items]
Real Estate property type	ALF
Property Acquired Purchase Price	32,000
July | SNF/ALF | Massachusetts
Real Estate Properties [Line Items]
Real Estate property type	SNF/ALF
Property Acquired Purchase Price	50,000
September | SNF/ALF | Washington/ Idaho
Real Estate Properties [Line Items]
Real Estate property type	SNF/ALF
Property Acquired Purchase Price	83,600
February | Texas
Real Estate Properties [Line Items]
Real Estate property type	Land Held for Development
Property Acquired Purchase Price	$ 2,110