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Schedule of Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Long-term debt	$ 1,111,545	$ 1,245,014
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	655,000	265,000
Senior Notes 6.25% Due 2013
Debt Instrument [Line Items]
Long-term debt		375,000
Senior Notes 6.75% Due 2014
Debt Instrument [Line Items]
Long-term debt		150,000
Senior Notes 7.75% Due 2017
Debt Instrument [Line Items]
Long-term debt	$ 456,545	$ 455,014

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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