Accumulated Other Comprehensive Income Balances (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 12,023
Reclassification to the income statement	(1,900)
Change in fair value	2,143
Ending Balance	12,266
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	9,545
Change in fair value	3,664
Ending Balance	13,209
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,478
Reclassification to the income statement	(1,900)
Change in fair value	(1,521)
Ending Balance	$ (943)