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Movement of Deferred Tax Assets Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Income Tax Asset [Line Items]
At beginning of the year	$ 1,344	$ 916	$ 1,223
Current year (reduction) addition	3,972	428	(307)
At end of the year	$ 5,316	$ 1,344	$ 916

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.