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Restructuring and Impairment Charges (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]  
Severance and related costs $ 4,545
Retiree medical benefits 2,300
Other asset impairments 539
Total charges $ 7,384 [1]
[1] These amounts have been included in restructuring and impairment charges on our condensed consolidated statements of comprehensive income.