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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Disclosure Fair Value Of Financial Instruments Additional Information [Abstract]
Investments, Fair Value Disclosure	$ 3,098,000	$ 4,168,000
Long-term debt including current maturities	122,000,000	110,100,000
Fair value of long-term debt	$ 136,800,000	$ 133,200,000

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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