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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill $ 120,534 $ 119,332
Accumulated impairment losses (70,004) (70,004)
Net Goodwill 50,530 49,328
U.S. Insulation [Member]
   
Goodwill [Line Items]    
Goodwill 1,202  
Accumulated impairment losses     
Net Goodwill $ 1,202