The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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.

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Fair Value Measurements - Fair Values of Financial Instruments not Recorded at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	May 19, 2014	Dec. 31, 2013
4.9% Senior Notes due 2044
Fair Value Measurements [Line Items]
Senior notes	$ 700,000
3.8% Senior Notes due 2024
Fair Value Measurements [Line Items]
Senior notes	1,000,000
Carrying Amount
Fair Value Measurements [Line Items]
Credit facility	0	1,010,000	275,000
Note payable	16,967		18,470
Total debt	5,833,922		4,715,832
Carrying Amount \| 8.25% Senior Notes due 2019 (1)
Fair Value Measurements [Line Items]
Senior notes	0		298,305
Carrying Amount \| 7.375% Senior Notes due 2020
Fair Value Measurements [Line Items]
Senior notes	198,809		198,695
Carrying Amount \| 7.125% Senior Notes due 2021
Fair Value Measurements [Line Items]
Senior notes	400,000		400,000
Carrying Amount \| 5% Senior Notes due 2022
Fair Value Measurements [Line Items]
Senior notes	2,023,568		2,025,362
Carrying Amount \| 4.5% Senior Notes Due 2023
Fair Value Measurements [Line Items]
Senior notes	1,500,000		1,500,000
Carrying Amount \| 4.9% Senior Notes due 2044
Fair Value Measurements [Line Items]
Senior notes	698,030		0
Carrying Amount \| 3.8% Senior Notes due 2024
Fair Value Measurements [Line Items]
Senior notes	996,548		0
Fair Value
Fair Value Measurements [Line Items]
Credit facility	0		275,000
Note payable	15,186		16,500
Total debt	6,077,616		4,876,000
Fair Value \| 8.25% Senior Notes due 2019 (1)
Fair Value Measurements [Line Items]
Senior notes	0		327,800
Fair Value \| 7.375% Senior Notes due 2020
Fair Value Measurements [Line Items]
Senior notes	220,940		223,700
Fair Value \| 7.125% Senior Notes due 2021
Fair Value Measurements [Line Items]
Senior notes	443,240		450,300
Fair Value \| 5% Senior Notes due 2022
Fair Value Measurements [Line Items]
Senior notes	2,106,000		2,063,300
Fair Value \| 4.5% Senior Notes Due 2023
Fair Value Measurements [Line Items]
Senior notes	1,560,000		1,519,400
Fair Value \| 4.9% Senior Notes due 2044
Fair Value Measurements [Line Items]
Senior notes	728,350		0
Fair Value \| 3.8% Senior Notes due 2024
Fair Value Measurements [Line Items]
Senior notes	$ 1,003,900		$ 0