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Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Long-term debt	$ 2,100,000	$ 2,100,000	$ 2,100,000
Less: current portion	0	0	0
Total long-term debt	2,100,000	2,100,000	2,100,000
2010 Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000	500,000	500,000
2011 Senior Notes
Debt Instrument [Line Items]
Long-term debt	600,000	600,000	600,000
2013 Senior Notes
Debt Instrument [Line Items]
Long-term debt	500,000	500,000	500,000
2014 Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 500,000	$ 500,000	$ 500,000

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.16)



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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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