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Future Principal Payments on Term Loan (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Term loan balance payable as of December 31, 2012	$ 53,149	$ 127,557
March 31, 2013
Debt Instrument [Line Items]
Future principal payments on company's term loan, 2013	26,574
July 31, 2013 (maturity)
Debt Instrument [Line Items]
Future principal payments on company's term loan, 2013	$ 26,575

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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