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Long-Term Debt and Financing Arrangements - Schedule of Outstanding Debt (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Outstanding [Line Items]
Equipment Notes due by June 19, 2018 with quarterly principal and interest payments of $480,000 commencing on August 14, 2013; interest is paid quarterly at a fixed rate between 1.9% and 2.0%	$ 9,120
Total Notes	9,120
Less current portion	(1,755)
Total long-term debt	$ 7,365

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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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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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