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Securities Available For Sale (Narrative) (Detail) (Auction Rate Securities [Member], USD $) In Millions, unless otherwise specified	39 Months Ended	42 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended
	Dec. 31, 2012	Mar. 31, 2013	Mar. 31, 2013 Minimum [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Collateralized Debt Obligations [Member] Y	Mar. 31, 2013 Collateralized Debt Obligations [Member] Minimum [Member]	Mar. 31, 2013 Collateralized Debt Obligations [Member] Maximum [Member]	Mar. 31, 2013 Asset-backed Securities [Member] Minimum [Member] Y	Mar. 31, 2013 Asset-backed Securities [Member] Maximum [Member] Y
Schedule of Available-for-sale Securities [Line Items]
Investment, debt security, default rate of underlying assets					6.22%	8.00%	9.00%
Auction-rate securities yield rate			1.43%	2.46%
Cumulative credit and other losses recognized in earnings	$ 3.3	$ 3.3
Par value of securities held	$ 17.9	$ 17.9
Contractual maturities of securities, in years					4			15	35

For investments which are quantified by principal amount, the principle balance held at close of period.

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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