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Subsequent Events - Additional Information (Detail)
12 Months Ended
Feb. 03, 2017
ft²
Option
Oct. 21, 2015
Dec. 31, 2016
Subsequent Event [Line Items]      
Lease term   20 years 20 years
Occupational Safety and Health Administration [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Acquisition of lease property | ft² 75,000    
Lease term 20 years    
Building constructed year 2003    
Number of renewal options | Option 2    
Lease renewal term 5 years    
Lease expiration year 2034