Summary of Significant Accounting Policies (Details) - segment	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016
Summary of Significant Accounting Policies
Residency agreement term, minimum		30 days
Residency agreement term, maximum		1 year
Maximum period available for occupancy from cessation of significant construction activity		1 year
Maximum useful life of building and improvements		60 years
Investments classified as cash equivalents, maximum maturity period		3 months
Failure to qualify as REIT, ineligibility period		4 years
Number of reportable segments	5