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Acquisition - Summary of Amounts Recognized for Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Apr. 30, 2016
Jan. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 4,226 $ 4,155 $ 2,600
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