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Annual Future Minimum Lease Payments Required under Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leased Assets [Line Items]
2013	$ 1,646
2014	1,153
2015	366
2016	27
Total minimum lease payments	$ 3,192

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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