Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2015
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
Failure to qualify as REIT, ineligibility period	4 years