Organization - Narratives (Details)
$ in Thousands, ft² in Millions
12 Months Ended 73 Months Ended 120 Months Ended
Dec. 31, 2016
USD ($)
ft²
segment
property
tenant
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jan. 31, 2013
USD ($)
Dec. 31, 2016
USD ($)
ft²
property
tenant
Real Estate Properties          
Capital interest in operating partnership 99.99%       99.99%
Number of real estate properties 395       395
Number of tenants | tenant 121       121
Square footage of real estate properties | ft² 43       43
Number of reportable segments | segment 2        
Proceeds from issuance of shares, net of issuance costs | $ $ 103,618 $ 103,657 $ 101,983 $ 2,900,000  
Proceeds from DRIP shares | $         $ 574,000
Operating real estate          
Real Estate Properties          
Number of real estate properties 38       38
Square footage of operating properties | ft² 3       3
Self storage          
Real Estate Properties          
Number of real estate properties 37       37
Hotel          
Real Estate Properties          
Number of real estate properties 1       1