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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Long-term debt including current maturities	$ 169,700,000	$ 122,000,000
Fair value of long-term debt	186,600,000	136,800,000
Total Long-term debt	$ 176,157,000	$ 128,945,000

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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