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Senior Notes - Summary of Fixed-Rate Senior Notes (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Senior Notes	$ 2,425,200,000	$ 1,825,200,000
Debt premium	200,000	4,000,000
Total Senior Notes	2,754,120,000	2,147,097,000
Debt Instrument, Stated Percentage Rate, Minimum	3.375%
Debt Instrument, Stated Percentage Rate, Maximum	9.625%
Debt Instrument Effective Interest Rate Minimum	3.50%
Debt Instrument Effective Interest Rate Maximum	9.90%
Maturity Date Range, Start	May 15, 2015
Maturity Date Range, End	May 15, 2023
Senior Convertible Notes due 2040 [Member]
Debt Instrument [Line Items]
Senior Convertible Notes	$ 328,669,000	$ 317,880,000
Debt Instrument, Stated Percentage	1.75%
Debt Instrument Effective Interest Rate	5.30%
Debt Instrument, Maturity Date	Nov. 15, 2040

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Senior Notes not including discount or accretion.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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