v3.5.0.2
Debt - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Feb. 01, 2016
USD ($)
extension_option
Aug. 05, 2015
USD ($)
May 30, 2014
USD ($)
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
property
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Line of Credit Facility [Line Items]                
Payments on the mortgage notes payable           $ 95,022,000 $ 1,351,000  
Interest expense       $ 5,440,000 $ 5,989,000 11,627,000 11,890,000  
Amortization of deferred financing costs       600,000 $ 600,000 1,100,000 1,100,000  
Write-off of deferred financing costs           326,000 $ 0  
Interest payable       1,300,000   1,300,000   $ 1,900,000
Unsecured Revolving Credit Facility [Member]                
Line of Credit Facility [Line Items]                
Unsecured revolving credit facility       68,000,000   68,000,000   45,000,000
Senior Unsecured Term Loan [Member]                
Line of Credit Facility [Line Items]                
Unsecured revolving credit facility       $ 99,382,000   $ 99,382,000   $ 0
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   10    
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%   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] | 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%          
Senior Unsecured Notes [Member] | Ensign [Member]                
Line of Credit Facility [Line Items]                
Approximate amount transferred from net proceeds     $ 220,800,000          
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] | Base Rate [Member]                
Line of Credit Facility [Line Items]                
Debt instrument, basis spread   0.75%            
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] | 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] | Base Rate [Member]                
Line of Credit Facility [Line Items]                
Debt instrument, basis spread   1.40%            
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] | 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       $ 68,000,000   $ 68,000,000    
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] | 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] | Maximum [Member] | Base Rate [Member]                
Line of Credit Facility [Line Items]                
Debt instrument, basis spread 1.60%              
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] | 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