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Schedule of Interest Rate Swap Agreements on Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013 Interest Rate Swap	Dec. 31, 2012 Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Beginning balance			$ (243,051)	$ (218,451)
Unrealized gain (loss) on interest rate swaps	(50,129)	(44,593)	15,030	(141,392)
Reclassification of net losses included in income statement			91,470	116,792
Ending balance			$ (136,551)	$ (243,051)

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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