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Fair Value Measurements (Schedule Of Accumulated Other Comprehensive Loss - Interest Rate Swaps) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013 Accumulated other comprehensive loss [Member]
Derivative Instruments
Balance at beginning of year	$ 100,292	$ 134,067	$ 48,180
Other comprehensive income	52,112	33,775	(48,180)
Balance at end of year	$ 48,180	$ 100,292	$ 0

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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