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Store Acquisitions and Dispositions- Additional Information (Detail)
$ in Thousands
9 Months Ended 12 Months Ended
Jul. 26, 2016
USD ($)
store
Apr. 20, 2016
USD ($)
store
Apr. 01, 2016
USD ($)
store
shares
Sep. 30, 2016
USD ($)
Dec. 31, 2014
store
New Jersey And Virginia, 5 Stores Acquired in 2014 [Member]          
Property Acquisition And Dispositions [Line Items]          
Number of operating stores acquired | store         5
Increase in payments due to sellers resulting from higher rental income of properties       $ 1,544  
Disposal of Texas Store, April 1, 2016 [Member]          
Property Acquisition And Dispositions [Line Items]          
Number of stores sold | store     1    
Store Dispositions [Member] | Disposal of Indiana Stores, July 26, 2016 [Member]          
Property Acquisition And Dispositions [Line Items]          
Number of stores sold | store 1        
Proceeds from sale of real estate $ 4,447        
Gain (loss) on disposal of real estate $ 0        
Store Dispositions [Member] | Disposal of Ohio and Indiana Stores, April 20, 2016 [Member]          
Property Acquisition And Dispositions [Line Items]          
Number of stores sold | store   7      
Proceeds from sale of real estate   $ 17,555      
Gain (loss) on disposal of real estate   $ 11,265      
Store Dispositions [Member] | Disposal of Texas Store, April 1, 2016 [Member]          
Property Acquisition And Dispositions [Line Items]          
Gain (loss) on disposal of real estate     $ 93    
OP Units received for store disposal (in units) | shares     85,452    
Value of OP Units received for store disposal     $ 7,689