Derivative Instruments And Other Hedging Activities (Schedule Of Derivative Instruments On The Consolidated Financial Statements) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	$ (3,144)	$ 8,953	$ (3,144)	$ 8,953
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(400)	(430)	(787)	(856)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Amount of Gain (Loss) Recognized in Income on Derivatives		(1)		(2)
Other Income [Member] | Interest Rate Contract [Member] | Not Designated As Hedging Instrument [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives		(1)		(2)
Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments And Hedging Activities [Line Items]
Amount of Gain (Loss) Recognized in OCI, net of taxes (Effective Portion)	(3,144)	8,953	(3,144)	8,953
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(400)	(430)	(787)	(856)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)