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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Long-term debt including current maturities	$ 161,400,000us-gaap_LongTermDebt	$ 161,500,000us-gaap_LongTermDebt
Fair value of long-term debt	182,200,000us-gaap_LongTermDebtFairValue	180,700,000us-gaap_LongTermDebtFairValue
Total Long-term debt	$ 167,199,000	$ 167,595,000

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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