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Notes Payable - Summary of Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Payments/Long term debt, Total	$ 41,475	$ 18,034
Less current portion	(825)	(459)
Long term portion	40,650	17,575
Credit Facility [Member]
Debt Instrument [Line Items]
Payments/Long term debt, Total	40,000	17,400
3.25 % notes payable due in next year [Member]
Debt Instrument [Line Items]
Payments/Long term debt, Total	$ 1,475	$ 634

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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