Future Maturities Of Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Senior Notes
Debt Instrument [Line Items]
Discount on Senior Notes	$ 4.6
Adjustment for fair value hedges	$ 5.2
Senior Notes Four Point Nine Five Percent Due April One Two Thousand Fourteen
Debt Instrument [Line Items]
Interest rate	4.95%
Maturity date	Apr. 01, 2014
Senior Notes Eight Point Two Five Percent Due March Fifteen Two Thousand Nineteen
Debt Instrument [Line Items]
Interest rate	8.25%
Maturity date	Mar. 15, 2019