Quarterly report pursuant to Section 13 or 15(d)

Investment in Storage Facilities - Summary of Activity in Storage Facilities (Detail)

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Investment in Storage Facilities - Summary of Activity in Storage Facilities (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Cost:  
Beginning balance $ 2,491,702
Acquisition of storage facilities 327,408
Improvements and equipment additions 6,651
Additions to consolidated subsidiary 1,815
Net increase in construction in progress 6,106
Dispositions (696)
Ending balance 2,832,986
Accumulated Depreciation:  
Beginning balance 465,195
Additions during the period 15,255
Dispositions (591)
Ending balance $ 479,859