Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMMARY OF SIGNIFICANT ACCOUNTING POLICIES\ (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMMARY OF SIGNIFICANT ACCOUNTING POLICIES\ (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2013
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
segment
Dec. 31, 2014
USD ($)
Property, Plant and Equipment [Line Items]        
Advertising costs   $ 0.8 $ 2.4 $ 1.7
Number of reportable segments | segment     1  
NSA Predecessor [Member]        
Property, Plant and Equipment [Line Items]        
Advertising costs $ 0.2      
Building and Improvements [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life     7 years  
Building and Improvements [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life     40 years  
Furniture and Equipment [Member] | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life     3 years  
Furniture and Equipment [Member] | Maximum [Member]        
Property, Plant and Equipment [Line Items]        
Useful life     10 years  
Leases, Acquired-in-Place [Member]        
Property, Plant and Equipment [Line Items]        
Customer in-place lease, useful life     12 months  
Customer in-place lease amortization expense   $ 2.6 $ 12.0 $ 8.3