Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Less: Current portion of long-term debt	$ (2,110)	$ (2,078)
Long-term debt, net of current portion	$ 6,988,046	5,926,800
7.375% Senior Notes due 2020
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	7.375%
7.125% Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	7.125%
5% Senior Notes due 2022
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	5.00%
Note Payable [Member]
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	3.14%
Note payable	$ 22,000
3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	3.80%
4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	4.90%
Carrying Amount
Debt Instrument [Line Items]
Credit facility	$ 1,225,000	165,000
Note payable	15,349	16,375
Total debt	6,990,156	5,928,878
Carrying Amount \| 7.375% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes	196,278	195,997
Carrying Amount \| 7.125% Senior Notes due 2021
Debt Instrument [Line Items]
Senior notes	395,007	394,668
Carrying Amount \| 5% Senior Notes due 2022
Debt Instrument [Line Items]
Senior notes	1,996,664	1,996,507
Carrying Amount \| 4 1/2% Senior Notes Due 2023
Debt Instrument [Line Items]
Senior notes	1,481,446	1,480,479
Carrying Amount \| 3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Senior notes	989,431	988,940
Carrying Amount \| 4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Senior notes	690,981	690,912
Fair Value
Debt Instrument [Line Items]
Credit facility	1,225,000	165,000
Note payable	13,600	14,900
Total debt	6,785,700	5,485,700
Fair Value \| 7.375% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes	211,200	213,000
Fair Value \| 7.125% Senior Notes due 2021
Debt Instrument [Line Items]
Senior notes	426,000	421,000
Fair Value \| 5% Senior Notes due 2022
Debt Instrument [Line Items]
Senior notes	1,970,000	1,857,900
Fair Value \| 4 1/2% Senior Notes Due 2023
Debt Instrument [Line Items]
Senior notes	1,439,800	1,372,800
Fair Value \| 3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Senior notes	910,800	868,700
Fair Value \| 4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Senior notes	$ 589,300	$ 572,400

Contractual interest rate for funds borrowed, under the debt agreement.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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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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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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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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