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Contingencies - Additional Information (Detail) (USD $)	Jun. 30, 2012
Loss Contingencies [Line Items]
Reserve for environmental matters	$ 11,889,000
Environmental Issue
Loss Contingencies [Line Items]
Estimated total liability for environmental sites range, minimum	11,900,000
Estimated total liability for environmental sites range, maximum	71,500,000
Estimated total liability for environmental sites range, largest	$ 6,100,000

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

The estimated maximum amount of possible loss from the contingency.

The estimated minimum amount of possible loss from the contingency.