Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail)

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Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]        
Rental Revenue   $ 1,014   $ 1,207
Earnings   495   $ 861
Richardson, TX [Member]        
Business Acquisition [Line Items]        
Acquisition Date       Mar. 06, 2015
Rental Revenue   657   $ 839
Earnings   90   $ 328
Birmingham, AL [Member]        
Business Acquisition [Line Items]        
Acquisition Date       Mar. 20, 2015
Rental Revenue   83   $ 94
Earnings   (22)   $ 106
Columbus, OH [Member]        
Business Acquisition [Line Items]        
Acquisition Date       May 28, 2015
Rental Revenue   67   $ 67
Earnings   149   $ 149
Salt Lake City UT [Member]        
Business Acquisition [Line Items]        
Acquisition Date     May 26, 2016 May 29, 2015
Rental Revenue $ 139 207 $ 139 $ 207
Earnings $ 35 $ 278 $ 35 $ 278