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Goodwill and Identifiable Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
May. 12, 2015
Dec. 31, 2014
Goodwill [Line Items]      
Goodwill [1] $ 1,904.7   $ 1,467.8
Identifiable intangible assets, tradenames 858.8   $ 656.5
Norcraft Companies, Inc [Member]      
Goodwill [Line Items]      
Goodwill   $ 450.5  
Goodwill increase (decrease) due to acquisition-related adjustments 436.9    
Norcraft and Anaheim [Member]      
Goodwill [Line Items]      
Increase in gross identifiable intangible assets acquired $ 209.2    
Minimum [Member] | Tradenames and Customer Relationship [Member]      
Goodwill [Line Items]      
Amortizable identifiable intangible assets, estimated useful life 5 years    
Maximum [Member] | Tradenames and Customer Relationship [Member]      
Goodwill [Line Items]      
Amortizable identifiable intangible assets, estimated useful life 30 years    
[1] Net of accumulated impairment losses of $399.5 million in the Doors segment.