CONCENTRATION OF CREDIT RISK - Senior Living Operations (Details)	Jun. 30, 2019 board_member property
Atria
Concentration Risk
Ownership interests accounted for under the equity method	34.00%
Number of board members appointed	2
Number of board members	6
Eclipse Senior Living
Concentration Risk
Ownership interests accounted for under the equity method	34.00%
Number of board members appointed	2
Number of board members	6
Remaining ownership percentage retained by investee	66.00%
Consolidated Seniors Housing Communities
Concentration Risk
Number of independent third party managed properties | property	367
Consolidated Seniors Housing Communities | Atria, Sunrise and ESL
Concentration Risk
Number of independent third party managed properties | property	347