Quarterly report pursuant to Section 13 or 15(d)

Investment in Storage Facilities and Intangible Assets - Schedule of Acquired Facilities and Purchase Price of Facilities (Detail)

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Investment in Storage Facilities and Intangible Assets - Schedule of Acquired Facilities and Purchase Price of Facilities (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Property
Investment Holdings [Line Items]  
Number of Properties | Property 2
Purchase Price $ 19,487
Consideration paid, Cash Paid 19,409
Consideration paid, Net Other Liabilities (Assets) Assumed 78
Land 3,345
Building, Equipment, and Improvements 15,827
In-Place Customer Leases $ 315
NH [Member] | Date of Acquisition, 9/4/2018 [Member]  
Investment Holdings [Line Items]  
Number of Properties | Property 1
Date of Acquisition Sep. 04, 2018
Purchase Price $ 5,641
Consideration paid, Cash Paid 5,609
Consideration paid, Net Other Liabilities (Assets) Assumed 32
Land 1,256
Building, Equipment, and Improvements 4,276
In-Place Customer Leases $ 109
CA [Member] | Date of Acquisition, 9/18/2018 [Member]  
Investment Holdings [Line Items]  
Number of Properties | Property 1
Date of Acquisition Sep. 18, 2018
Purchase Price $ 13,846
Consideration paid, Cash Paid 13,800
Consideration paid, Net Other Liabilities (Assets) Assumed 46
Land 2,089
Building, Equipment, and Improvements 11,551
In-Place Customer Leases $ 206