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Business Segment Information - Goodwill (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill      
Goodwill $ 221,717 $ 220,163 $ 165,861
Environmental Segment [Member]      
Goodwill      
Goodwill 55,031 55,031  
Energy Segment [Member]      
Goodwill      
Goodwill 73,629 72,075  
Fluid Handling and Filtration Segment [Member]      
Goodwill      
Goodwill $ 93,057 $ 93,057