NSA PREDECESSOR CONTRIBUTIONS (Details)
$ in Thousands
 3 Months Ended 10 Months Ended
Apr. 01, 2014
property
Jun. 10, 2013
property
Apr. 01, 2013
USD ($)
property
Mar. 31, 2013
property
Mar. 31, 2014
property
Total Predecessor [Member]          
Assets acquired:          
Self storage properties, net     $ 171,537    
Cash and cash equivalents     3,528    
Restricted cash     2,567    
Debt issuance costs, net     816    
Other assets, net     910    
Total assets acquired     179,358    
Liabilities assumed:          
Debt financing     (188,402)    
Accounts payable and accrued liabilities     (3,021)    
Deferred revenue     (1,339)    
Predecessor deficit     (13,404)    
Contributions to NSA [Member]          
Assets acquired:          
Self storage properties, net     159,509    
Cash and cash equivalents     3,469    
Restricted cash     2,567    
Debt issuance costs, net     816    
Other assets, net     795    
Total assets acquired     167,156    
Liabilities assumed:          
Debt financing     (186,769)    
Accounts payable and accrued liabilities     (2,920)    
Deferred revenue     (1,242)    
Predecessor deficit     $ (23,775)    
Exclusions [Member]          
Business Acquisition [Line Items]          
Number of properties contributed | property 65 23 88   88
Assets acquired:          
Self storage properties, net     $ 12,028    
Cash and cash equivalents     59    
Restricted cash     0    
Debt issuance costs, net     0    
Other assets, net     115    
Total assets acquired     12,202    
Liabilities assumed:          
Debt financing     (1,633)    
Accounts payable and accrued liabilities     (101)    
Deferred revenue     (97)    
Predecessor deficit     $ 10,371    
Number of properties not meeting criteria for contribution | property     22 22