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Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Senior Secured Credit Facilities (long-term portion)	$ 362,697	$ 322,664
Senior Secured Credit Facilities (current portion)	78,770	44,677
Total debt	$ 441,467	$ 367,341

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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