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Summary Revolving Line of Credit And Various Notes Payable Constitute Short-Term and Long-Term Loan Balances Together (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Extinguishment of Debt [Line Items]
Indebtedness, Long-term	$ 85,036us-gaap_LongTermDebtNoncurrent	$ 99,455us-gaap_LongTermDebtNoncurrent
Indebtedness, Short-term	272us-gaap_LongTermDebtCurrent	71us-gaap_LongTermDebtCurrent
Revolving Line of Credit
Extinguishment of Debt [Line Items]
Indebtedness, Long-term	85,000	99,400
Total indebtedness	85,000	99,400
Notes payable
Extinguishment of Debt [Line Items]
Indebtedness, Long-term	36	55
Indebtedness, Short-term	272	71
Total indebtedness	308	126
Debt
Extinguishment of Debt [Line Items]
Indebtedness, Long-term	85,036	99,455
Indebtedness, Short-term	272	71
Total indebtedness	$ 85,308	$ 99,526

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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