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Fair Value Measurements (Narrative) (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated fair value of the debt	$ 324,700,000
US Treasury Notes Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale securities, debt maturities, period	March and June of 2013	January and May of 2012
Available-for-sale securities, amortized cost	224,900,000	75,000,000
Available-for-sale securities, gross unrealized gain (loss)	$ 0	$ 0

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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