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Commitments And Contingencies - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
BRL
May 08, 2012
USD ($)
Dec. 31, 2012
Arizona Department Of Environmental Quality
USD ($)
Nov. 30, 2011
Court-imposed interest, fees or inflation adjustments
Maximum
USD ($)
Nov. 30, 2011
Court-imposed interest, fees or inflation adjustments
Maximum
BRL
Dec. 31, 2012
Standby Letters of Credit
USD ($)
Loss Contingencies [Line Items]              
Damages asserted by BK   20.8   $ 0.2   26.7  
Loss contingency damages awarded value exchange rate differance         13.1    
Total ordered damages granted to Bk         54    
Amount of remediation plan for the RID portion of the Superfund Site approved by ADEQ 100            
Loss Contingency, Estimate of Possible Loss       1      
Letters of Credit Outstanding, Amount             7.2
Purchase Obligation 18.6            
Walker acquisition, Purchase price     $ 375