Quarterly report pursuant to Section 13 or 15(d)

Investment in Storage Facilities - Summary of Revenues and Expenses Related to Sale of Properties Included in Company's Consolidated Statements of Operations (Detail)

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Investment in Storage Facilities - Summary of Revenues and Expenses Related to Sale of Properties Included in Company's Consolidated Statements of Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total revenues $ 99,124 $ 85,408
Property operations and maintenance expense (22,861) (20,559)
Real estate tax expense (10,547) (8,920)
Depreciation and amortization expense $ (16,425) (14,181)
Loss on sale of storage facilities   (7)
Properties Sold In Two Thousand And Fifteen Member    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total revenues   40
Property operations and maintenance expense   (16)
Real estate tax expense   (5)
Depreciation and amortization expense   (9)
Loss on sale of storage facilities   (7)
Total income from discontinued operations   $ 3