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Commitments and Contingencies - Activity Related to Asbestos Claims (Detail) (Asbestos Related Matters [Member])
12 Months Ended
Dec. 31, 2012
Claim
Dec. 31, 2011
Claim
Dec. 31, 2010
Claim
Schedule Of Activities Related To Claims Filed [Line Items]      
Pending claims - Beginning 105,000 104,000 105,000
New claims 4,000 5,000 6,000
Settlements (1,000) (2,000) (1,000)
Dismissals (12,000) (2,000) (6,000)
Pending claims - Ending 96,000 105,000 104,000
Inactive [Member]
     
Schedule Of Activities Related To Claims Filed [Line Items]      
Pending claims - Ending 29,000 39,000 40,000
Active [Member]
     
Schedule Of Activities Related To Claims Filed [Line Items]      
Pending claims - Ending 67,000 66,000 64,000