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Postretirement Benefit Plans - Actual Versus Expected Long-Term Returns for Our Domestic Pension Plans (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 8.00% 9.00% 9.00%
Actual rate of return on plan assets 11.10% (3.20%) 14.10%