Goodwill and Other Intangible Assets, Net (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Goodwill [Line Items]
Gross Carrying Amount	$ 735,758,000		$ 737,574,000
Accumulated Impairment and Other Charges	(769,000)		(769,000)
Net	734,989,000		736,805,000
Goodwill, Purchase Accounting Adjustments	1,800,000
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	164,577,000		161,607,000
Accumulated Amortization	(9,900,000)		(6,834,000)
Net	154,677,000		154,773,000
Amortization expense related to definite-lived intangible assets	3,100,000	1,200,000
Community Purchase Options [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	55,738,000		55,738,000
Accumulated Amortization	0		0
Net	55,738,000		55,738,000
Health Care Licenses [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	67,508,000		64,538,000
Accumulated Amortization	0		0
Net	67,508,000		64,538,000
Other [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	13,531,000		13,531,000
Accumulated Amortization	(3,214,000)		(2,655,000)
Net	10,317,000		10,876,000
Tradenames [Member]
Schedule of Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	27,800,000		27,800,000
Accumulated Amortization	(6,686,000)		(4,179,000)
Net	21,114,000		23,621,000
Retirement Centers [Member]
Goodwill [Line Items]
Gross Carrying Amount	28,141,000		28,141,000
Accumulated Impairment and Other Charges	(521,000)		(521,000)
Net	27,620,000		27,620,000
Assisted Living [Member]
Goodwill [Line Items]
Gross Carrying Amount	580,807,000		582,623,000
Accumulated Impairment and Other Charges	(248,000)		(248,000)
Net	580,559,000		582,375,000
CCRCs Rental [Member]
Goodwill [Line Items]
Gross Carrying Amount	126,810,000		126,810,000
Accumulated Impairment and Other Charges	0		0
Net	$ 126,810,000		$ 126,810,000