Contingencies - Additional Information (Detail)	0 Months Ended	1 Months Ended			6 Months Ended	1 Months Ended
	May 08, 2012 USD ($)	Nov. 22, 2011 USD ($)	Nov. 22, 2011 BRL	Jun. 30, 2010 USD ($)	Jun. 30, 2013 BRL	Nov. 22, 2011 Court-imposed interest, fees or inflation adjustments Maximum USD ($)
Loss Contingencies [Line Items]
Damages asserted by BK					20,800,000
Total ordered damages granted to Bk		11,900,000	26,700,000			54,000,000
Amount of remediation plan for the RID portion of the Superfund Site approved by ADEQ				100
Walker acquisition, Purchase price	$ 377,000,000