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Other Expense, net - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Other Income Expense [Line Items]    
Amount of guarantee obligations given by joint ventures   $ 20
Provisions for bad debt on receivables due from joint venture   2
Other - than - temporary impairment, gross 26  
Other - than - temporary impairment, net 18.0 23.5
Other - than - temporary impairment, net per share $ 0.09  
Write down of investment (expense)   4
Carrying Value of the investment   $ 0