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Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Foreign currency translation adjustment	$ (1,785)
Current period other comprehensive loss	(2,885)
Ending balance, Foreign currency translation adjustment	(4,670)
Beginning balance, Available-for-sale securities	(317)	(352)
Current period other comprehensive income	8	16
Ending balance, Available-for-sale securities	(309)	(336)
Accumulated other comprehensive loss, net of tax	$ (4,979)	$ (336)	$ (2,102)

X

- Definition

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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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Amount after tax, before reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency.

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