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Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 6,339 $ 3,833 $ 3,374
Charged to Costs and Expenses 2,069 2,834 1,048
Charged to Other Accounts 404 (332) (139)
Deductions Describe (2,991) 4 (450)
Balance at End of Period 5,821 6,339 3,833
Allowance for Obsolete Equipment and Inventory [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 750 1,032 1,073
Charged to Costs and Expenses   (60) 164
Charged to Other Accounts (58) (151) (15)
Deductions Describe 208 (71) (190)
Balance at End of Period $ 900 $ 750 $ 1,032