Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Rental Revenue $ 4,919 $ 5,605
Earnings $ 1,635 $ 2,492
Richardson, TX [Member]    
Business Acquisition [Line Items]    
Acquisition Date Mar. 06, 2015  
Rental Revenue $ 2,152  
Earnings $ 590  
Birmingham, AL [Member]    
Business Acquisition [Line Items]    
Acquisition Date Mar. 20, 2015  
Rental Revenue $ 260  
Earnings $ 105  
Columbus, OH [Member]    
Business Acquisition [Line Items]    
Acquisition Date May 28, 2015 May 13, 2014
Rental Revenue $ 421 $ 790
Earnings $ 181 $ 272
Salt Lake City, UT [Member]    
Business Acquisition [Line Items]    
Acquisition Date May 29, 2015  
Rental Revenue $ 1,368  
Earnings $ 344  
Atlanta, GA [Member]    
Business Acquisition [Line Items]    
Acquisition Date Jul. 15, 2015  
Rental Revenue $ 598  
Earnings $ 345  
Villa Rica GA [Member]    
Business Acquisition [Line Items]    
Acquisition Date Oct. 20, 2015  
Rental Revenue $ 120  
Earnings $ 70  
Allen, TX [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Mar. 27, 2014
Rental Revenue   $ 435
Earnings   $ 249
Colleyville, TX [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Mar. 27, 2014
Rental Revenue   $ 357
Earnings   $ 206
Rancho Cordova, CA [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Apr. 22, 2014
Rental Revenue   $ 625
Earnings   $ 239
Coppell, TX [Member]    
Business Acquisition [Line Items]    
Acquisition Date   May 08, 2014
Rental Revenue   $ 390
Earnings   $ 226
Taylor, PA [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Jun. 09, 2014
Rental Revenue   $ 1,908
Earnings   $ 890
Aurora, CO [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Jul. 01, 2014
Rental Revenue   $ 384
Earnings   $ 253
Indianapolis, Indiana Property [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Sep. 03, 2014
Rental Revenue   $ 489
Earnings   $ 44
Denver, CO [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Oct. 31, 2014
Rental Revenue   $ 166
Earnings   $ 82
Monroe, MI [Member]    
Business Acquisition [Line Items]    
Acquisition Date   Dec. 23, 2014
Rental Revenue   $ 61
Earnings   $ 31