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Schedule of Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 1,205,000	$ 1,111,545
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	530,000	655,000
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Long-term debt	350,000
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Long-term debt	325,000
Senior Notes 7.75% Due 2017
Debt Instrument [Line Items]
Long-term debt		$ 456,545

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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