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Future Minimum Lease Payments Under Terms of Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leased Assets [Line Items]
2013	$ 807
2014	817
2015	831
2016	423
2017	135
Thereafter	1,306
Operating Leases, Future Minimum Payments Due, Total	$ 4,319

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