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Environmental matters and other commitments and contingencies - Additional Information (Detail) (USD $)	Sep. 30, 2012
Environmental Matters And Other Commitments And Contingencies [Line Items]
Upper end of the range of reasonably possible costs	$ 2,000,000
Recorded accrual amount	300,000
Estimate cost of future remediation	30,000
Estimated cost of future remediation if MSD is not obtained	$ 1,700,000

Total costs accrued as of the balance sheet date for environmental loss contingencies.

The estimated maximum amount of possible loss from the contingency.