Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.4.0.3
Commitments and Contingencies - Additional Information (Detail)
$ in Millions
1 Months Ended
Apr. 26, 2016
Facility
May. 02, 2016
USD ($)
Facility
Apr. 13, 2016
Facility
Mar. 31, 2016
USD ($)
Facility
Commitment And Contingencies [Line Items]        
Payment for self-storage facilities under contract | $       $ 146.4
Number of self-storage facilities under contract to be purchased       13
Subsequent Event [Member] | Acquisition 2016 [Member]        
Commitment And Contingencies [Line Items]        
Payment for self-storage facilities under contract | $   $ 86.7    
Number of self-storage facilities under contract to be purchased     8  
Number of self-storage facilities under contract to be purchased 6 6