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Debt and Financing Arrangements - Summary of Reconciliation of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Debt Disclosure [Line Items]
Total debt	$ 79,719	$ 76,883
Less: current portion of long-term debt	7,143	7,143
Long-term debt, less current portion	72,576	69,740
Credit Agreement with Banks [Member]
Debt Disclosure [Line Items]
Total debt	51,148	48,312	8,000
Senior Notes under Master Shelf Agreement [Member]
Debt Disclosure [Line Items]
Total debt	$ 28,571	$ 28,571

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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