Annual report pursuant to Section 13 and 15(d)

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

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Investment in Storage Facilities - Schedule of Fair Value of In-Place Customer Lease Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Real Estate [Abstract]    
In-place customer leases $ 75,241 $ 75,611
Accumulated amortization $ (75,241) (50,782)
Net carrying value at the end of period   $ 24,829