Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Intangible Assets related to Acquisition (Details)

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Goodwill and Other Intangible Assets - Intangible Assets related to Acquisition (Details) - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) $ 156,288 $ 163,984
Finite-Lived Intangible Assets, Accumulated Amortization 67,627 59,986
Intangible Assets, Net (Excluding Goodwill) 88,661 103,998
Industrial Process Insulators, Inc.    
Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) 8,589 13,347
Finite-Lived Intangible Assets, Accumulated Amortization 1,759 1,046
Intangible Assets, Net (Excluding Goodwill) 6,830 12,301
Sumac Fabrication Company Limited    
Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) 2,714 2,806
Finite-Lived Intangible Assets, Accumulated Amortization 1,269 750
Intangible Assets, Net (Excluding Goodwill) 1,445 2,056
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Accumulated Amortization $ 61,697 54,913
Customer Relationships | Industrial Process Insulators, Inc.    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 8 years  
Intangible Assets, Gross (Excluding Goodwill) $ 5,962 10,720
Finite-Lived Intangible Assets, Accumulated Amortization 1,056 715
Intangible Assets, Net (Excluding Goodwill) $ 4,906 10,005
Customer Relationships | Sumac Fabrication Company Limited    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 4 years  
Intangible Assets, Gross (Excluding Goodwill) $ 2,526 2,612
Finite-Lived Intangible Assets, Accumulated Amortization 1,105 653
Intangible Assets, Net (Excluding Goodwill) $ 1,421 1,959
Trademarks | Industrial Process Insulators, Inc.    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 8 years  
Intangible Assets, Gross (Excluding Goodwill) $ 1,820 1,820
Finite-Lived Intangible Assets, Accumulated Amortization 322 152
Intangible Assets, Net (Excluding Goodwill) $ 1,498 1,668
Noncompete Agreements | Industrial Process Insulators, Inc.    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 3 years  
Intangible Assets, Gross (Excluding Goodwill) $ 807 807
Finite-Lived Intangible Assets, Accumulated Amortization 381 179
Intangible Assets, Net (Excluding Goodwill) $ 426 628
Noncompete Agreements | Sumac Fabrication Company Limited    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 2 years  
Intangible Assets, Gross (Excluding Goodwill) $ 188 194
Finite-Lived Intangible Assets, Accumulated Amortization 164 97
Intangible Assets, Net (Excluding Goodwill) $ 24 $ 97