Quarterly report pursuant to Section 13 or 15(d)

Investment in Storage Facilities and Intangible Assets - Schedule of Fair Value of In-Place Customer Lease Intangible Assets (Detail)

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Investment in Storage Facilities and Intangible Assets - Schedule of Fair Value of In-Place Customer Lease Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Real Estate [Abstract]    
In-place customer leases $ 75,226 $ 75,241
Accumulated amortization (74,920) $ (75,241)
Net carrying value at the end of period $ 306