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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Disclosure Fair Value Of Financial Instruments Additional Information [Abstract]
Investments, Fair Value Disclosure	$ 3,678,000us-gaap_InvestmentsFairValueDisclosure	$ 3,098,000us-gaap_InvestmentsFairValueDisclosure
Long-term debt including current maturities	161,500,000us-gaap_LongTermDebt	122,000,000us-gaap_LongTermDebt
Fair value of long-term debt	180,700,000us-gaap_LongTermDebtFairValue	136,800,000us-gaap_LongTermDebtFairValue
Guaranteed Income Fund [Member] \| Fair Value, Inputs, Level 3 [Member]
Disclosure Fair Value Of Financial Instruments Additional Information [Abstract]
Investments, Fair Value Disclosure	$ 287,000	$ 458,000

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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