Summary of Gain or Loss Recognized and Amounts and Location of Income or Expense and Gain or Loss Reclassified into Income for Interest Rate Contracts and Foreign Currency Contracts (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest rate agreements
Derivative [Line Items]
Gain(Loss) recognized in Other comprehensive Income		$ (36,295)		$ (36,407)
Expense and Gain Reclassified into Income	(1,898)	(1,515)	(5,743)	(4,593)
Income Statement Caption	Interest expense		Interest expense
Foreign Exchange Contract
Derivative [Line Items]
Gain(Loss) recognized in Other comprehensive Income				(55)
Expense and Gain Reclassified into Income				$ 227
Income Statement Caption			Sales