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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accounts Payable And Accrued Expenses
Income Taxes [Line Items]
Current taxes payable	$ 7.5	$ 7.9
Other Receivables
Income Taxes [Line Items]
Prepaid estimated taxes	$ 2.2

- Definition

Carrying amount as of the balance sheet date of payments made in advance for income and other taxes, which will be charged against earnings within one year or the normal operating cycle, if longer.

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