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Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 417,570	$ 317,896
Less—current portion	43	43
Long-term portion	417,527	317,853
6.875% Senior Notes, Due 2013
Debt Instrument [Line Items]
Long-term Debt	150,000	150,000
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt	267,000	167,000
Capital Lease Obligations
Debt Instrument [Line Items]
Long-term Debt	$ 570	$ 896

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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