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Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period other comprehensive loss			$ 4,840
Ending balance, Foreign currency translation adjustment	4,840		4,840
Beginning balance, Available-for-sale securities			352	355
Current period other comprehensive income	(4)	(4)	12	3
Ending balance, Available-for-sale securities	340	352	340	352
Beginning balance, Derivative instrument				238
Current period other comprehensive income		73		144
Ending balance, Derivative instrument		94		94
Accumulated other comprehensive loss, net of tax	$ 5,180	$ 446	$ 5,180	$ 446	$ 352

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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