Organization - Schedule of Assets and Liabilities Contributed to the Company from Ensign or Incurred in Connection with Spin-Off (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Real Estate Properties [Line Items]
Real estate investments, net	$ 893,918	$ 645,614
Deferred financing costs, net	2,803	3,183
Debt	(449,716)	$ (393,905)
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