Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 12,023
Reclassification to the income statement	(6,085)
Change in fair value	6,300
Ending Balance	12,238
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	9,545
Change in fair value	4,124
Ending Balance	13,669
Cash Flow Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,478
Reclassification to the income statement	(6,085)
Change in fair value	2,176
Ending Balance	$ (1,431)