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Acquisition - Summary of Amounts Recognized for Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Jan. 31, 2016
Dec. 31, 2015
Jan. 31, 2015
Jan. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 4,155   $ 5,594 $ 4,320
Klein Associates Inc. [Member]        
Business Acquisition [Line Items]        
Working capital   $ 2,572    
Property, plant and equipment   3,416    
Intangible assets   2,350    
Goodwill   $ 1,662