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Long-term Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Total debt	$ 18,480	$ 24,185
Less current maturities	1,000	1,000
Total	17,480	23,185
TFMC [Member]
Debt Instrument [Line Items]
Total debt	18,480	22,230
Revolving bank credit facility [Member]
Debt Instrument [Line Items]
Total debt		$ 1,955

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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