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Schedule of Interest Rate Swap Agreements on Accumulated Other Comprehensive Income (Detail) (Interest Rate Swap, USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	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	51,385	(141,392)
Reclassification of net losses included in income statement	60,515	116,792
Ending balance	$ (131,151)	$ (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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