Earnings Per Share (Schedule Of Convertible Debt, By Dilutive and Anti-Dilutive Classification) (Detail) (Convertible Debt [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012 New 4.0% Notes [Member]		Dec. 31, 2011 New 4.0% Notes [Member]		Dec. 31, 2012 New 4.25% Notes [Member]		Dec. 31, 2011 New 4.25% Notes [Member]		Dec. 31, 2012 Original 4.0% Notes [Member]		Dec. 31, 2011 Original 4.0% Notes [Member]		Dec. 31, 2010 Original 4.0% Notes [Member]		Jun. 30, 2009 Original 4.0% Notes [Member]	Dec. 31, 2012 Original 4.25% Notes [Member]		Dec. 31, 2011 Original 4.25% Notes [Member]		Dec. 31, 2010 Original 4.25% Notes [Member]		Nov. 30, 2009 Original 4.25% Notes [Member]	Dec. 31, 2012 Total Dilutive Convertible Debt [Member]	Dec. 31, 2011 Total Dilutive Convertible Debt [Member]	Dec. 31, 2010 Total Dilutive Convertible Debt [Member]
Debt Instrument [Line Items]
Convertible debt, outstanding principal amount	$ 105,322	[1]	$ 105,322	[1]	$ 97,000	[1]	$ 97,000	[1]	$ 9,700	[2]	$ 9,700	[2]	$ 115,000	[2]	$ 115,000	$ 3,000	[2]	$ 3,000	[2]	$ 100,000	[2]	$ 100,000	$ 215,000	$ 215,000	$ 215,000

[1] Dilutive shares associated with the New Notes are attributable to the premium over the respective conversion prices.

[2] Dilutive shares associated with the Original Notes are attributable to the underlying principal amounts.