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Litigation (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
House
Litigation (Textual) [Abstract] 
Approximate number of homes where the presence of Knauf Tianjin wallboard has been confirmed270
Approximate number of property damage claims resolved144
Accrual for estimated costs of resolving the Chinese wallboard property damage claims$ 15
Receivables related to settlement12
Accrual for environmental loss contingencies$ 13.0
Maximum [Member]
 
Litigation (Textual) [Abstract] 
Range of average-size houses that the amount of Knauf Tianjin wallboard potentially sold by L&W Supply Corporation could completely furnish300
Minimum [Member]
 
Litigation (Textual) [Abstract] 
Range of average-size houses that the amount of Knauf Tianjin wallboard potentially sold by L&W Supply Corporation could completely furnish250