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Income Taxes - Summary of Changes in Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation Allowance [Line Items]
Valuation allowance as of January 1	$ 26,353	$ 32,102	$ 30,975
Foreign tax credits		(186)	79
Net operating losses	946	1,844	13,381
Releases of valuation allowances in various jurisdictions	(4,423)	(7,407)	(12,333)
Valuation allowance as of December 31	$ 22,876	$ 26,353	$ 32,102

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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