Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Provisional Estimates and Final Estimates of Fair Value of Assets and Liabilities Assumed (Details)

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Goodwill and Other Intangible Assets - Provisional Estimates and Final Estimates of Fair Value of Assets and Liabilities Assumed (Details) - USD ($)
Jun. 30, 2016
Mar. 31, 2016
Jul. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 124,613,000 $ 121,510,000  
Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Identifiable intangible assets     $ 8,756,000
Goodwill 13,422   13,422,000
Noncurrent deferred tax liability 3,152   3,152,000
Customer Relationships | Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Identifiable intangible assets $ 5,692,000    
Previously Reported | Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Goodwill     10,204,000
Noncurrent deferred tax liability     4,962,000
Previously Reported | Customer Relationships | Industrial Process Insulators, Inc.      
Business Acquisition [Line Items]      
Identifiable intangible assets     $ 10,720,000