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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Related Party Transaction [Line Items]      
Fees paid $ 2,493 $ 2,752 $ 2,637
Fees due 217 203  
West Street Consultancy Limited      
Related Party Transaction [Line Items]      
Real estate commission paid 422 295 518
HED Real Estate BV      
Related Party Transaction [Line Items]      
Real estate commission paid $ 24 $ 300 $ 562