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Summary of Debt (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Various obligations under capital leases, with interest rates from 4.5% to 7.4%, due in various monthly installments, including interest, through various dates through January 2016, secured by equipment	$ 629	$ 1,003
Less current portion	273	390
Long-term obligation	$ 356	$ 613

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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