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Maturities on Long-Term Debt Obligations (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Long Term Debt Maturities Repayments Of Principal [Line Items]
2013	$ 273
2014	200
2015	146
2016	10
Long-term Debt, Total	$ 629

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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