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Short-Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Short-term Debt [Line Items]
Average balance of short-term debt	$ 362	$ 48
Weighted average interest rate	2.02%	1.52%
Accrued interest payable on short-term debt	$ 0.6		$ 0.6
Credit Agreement
Short-term Debt [Line Items]
Number of bank counterparties	10

Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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