Organization - Schedule of Assets and Liabilities Contributed to the Company from Ensign or Incurred in Connection with Spin-Off (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Real Estate Properties [Line Items]
Real estate investments, net	$ 651,554	$ 436,215
Deferred financing costs, net	9,793	10,405
Debt	(400,700)	$ (358,200)
Ensign [Member]
Real Estate Properties [Line Items]
Real estate investments, net	421,846
Cash	78,731
Accounts receivable and prepaid assets and other current assets	1,900
Deferred financing costs, net	11,088
Debt	(359,512)
Other liabilities	(6,838)
Net contribution	$ 147,215