Annual report pursuant to Section 13 and 15(d)

Acquisition, Goodwill and Other Intangible Assets - Acquisition Consideration (Details)

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Acquisition, Goodwill and Other Intangible Assets - Acquisition Consideration (Details) - USD ($)
$ in Thousands
Jul. 31, 2015
Apr. 01, 2015
Mar. 02, 2015
Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Consideration to or on behalf of sellers at close $ 21,750    
Fair value of total consideration transferred $ 21,750    
Sumac      
Business Acquisition [Line Items]      
Consideration to or on behalf of sellers at close   $ 10,956  
Fair value of total consideration transferred   $ 10,956  
Unitemp      
Business Acquisition [Line Items]      
Consideration to or on behalf of sellers at close     $ 3,890
Fair value of total consideration transferred     $ 3,890