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Commitments and Contingencies - Activity Related to Asbestos Claims (Parenthetical) (Detail) (Asbestos Related Matters [Member])
Dec. 31, 2012
Claim
Schedule Of Activities Related To Claims Filed [Line Items]  
Number of dismissed claims 12,000
Mississippi [Member]
 
Schedule Of Activities Related To Claims Filed [Line Items]  
Number of dismissed claims, inactive 10,000