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Payments Expected for Term Credit Facility Over Subsequent Five Year Period (Detail) (Term Credit Facility, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Term Credit Facility
Line of Credit Facility [Line Items]
Payments due by Remainder of 2013	$ 34,375
Payments due by 2014	65,625
Payments due by 2015	75,000
Payments due by 2016	307,500
Total	$ 482,500

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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