Debt - Additional Information (Detail)				3 Months Ended
	Feb. 01, 2016 USD ($) extension_option	Aug. 05, 2015 USD ($)	May. 30, 2014 USD ($)	Mar. 31, 2016 USD ($) property	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Payments on the mortgage notes payable				$ 95,022,000	$ 685,000
Interest expense				6,187,000	5,901,000
Amortization of deferred financing costs				600,000	500,000
Write-off of deferred financing costs				326,000	$ 0
Interest payable				$ 5,100,000		$ 1,900,000
General Electric Capital Corporation [Member] | Mortgage Notes Payable due May 30, 2017 [Member]
Line of Credit Facility [Line Items]
Number of properties subject to mortgage loans | property				10
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility				$ 5,000,000		45,000,000
Senior Unsecured Term Loan [Member]
Line of Credit Facility [Line Items]
Unsecured revolving credit facility				$ 99,361,000		$ 0
Senior Unsecured Notes [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount			$ 260,000,000.0
Debt instrument, interest rate			5.875%	5.875%
Proceeds from the issuance of senior unsecured notes payable			$ 260,000,000
Net proceeds from issuance of notes			$ 253,000,000
Debt instrument, maturity date				Jun. 01, 2021
Frequency of interest payable on notes				Interest on the Notes is payable on June 1 and December 1 of each year, beginning on December 1, 2014.
Debt instrument, early redeemable date				Jun. 01, 2017
Debt instrument, redemption price, percentage			100.00%
Debt instrument, redemption price, percentage upon change of control			101.00%
Senior Unsecured Notes [Member] | Ensign [Member]
Line of Credit Facility [Line Items]
Approximate amount transferred from net proceeds			$ 220,800,000
Senior Unsecured Notes [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Percentage of aggregate principal amount of notes outstanding			65.00%
Senior Unsecured Notes [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Redeemable percentage of aggregate principal amount of notes			35.00%
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity		$ 300,000,000.0
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage		0.15%
Line of credit facility, facility fee percentage		0.125%
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread		1.75%
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread		0.75%
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Line of credit facility, commitment fee percentage		0.25%
Line of credit facility, facility fee percentage		0.30%
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread		2.40%
Line of Credit [Member] | Unsecured Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread		1.40%
Line of Credit [Member] | Revolving Credit Facility As Amended [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity	$ 400,000,000.0
Line of credit facility, increase to borrowing capacity	100,000,000.0
Line of credit facility, increase to uncommitted incremental facility	50,000,000.0
Line of credit facility, uncommitted incremental facility limit	$ 250,000,000.0
Number of extension options | extension_option	2
Line of credit facility, extension period	6 months
Unsecured revolving credit facility				$ 5,000,000
Line of Credit [Member] | Revolving Credit Facility As Amended [Member] | Minimum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread	1.95%
Line of Credit [Member] | Revolving Credit Facility As Amended [Member] | Minimum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread	0.95%
Line of Credit [Member] | Revolving Credit Facility As Amended [Member] | Maximum [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread	2.60%
Line of Credit [Member] | Revolving Credit Facility As Amended [Member] | Maximum [Member] | Base Rate [Member]
Line of Credit Facility [Line Items]
Debt instrument, basis spread	1.60%
Line of Credit [Member] | Senior Unsecured Term Loan [Member]
Line of Credit Facility [Line Items]
Line of credit facility, borrowing capacity	$ 100,000,000.0
Line of credit facility, prepayment premium in first year	2.00%
Line of credit facility, prepayment premium in second year	1.00%
Mortgage notes payable
Line of Credit Facility [Line Items]
Payments on the mortgage notes payable	$ 95,000,000