Long-Term Debt - Additional Information (Detail) - USD ($)	6 Months Ended
Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.70%
Line of credit facility, maturity date	May 16, 2019
Aggregate amount of lender commitments on credit facility	$ 2,500,000,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 4,000,000,000.0
Line of credit facility, commitment fee percentage, per annum	0.225%
Current portion of long-term debt	$ 2,110,000	$ 2,078,000
Line of Credit Facility, Covenant Terms	0.65
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, unused commitments	$ 1,270,000,000
4.5% Senior Notes due 2023
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	4.50%
Debt Instrument, Maturity Date, Description	2023
Note Payable [Member]
Debt Instrument [Line Items]
Notes Payable	$ 22,000,000
Loan term	10 years
Debt Instrument, stated interest rate	3.14%
Debt Instrument, Maturity Date	Feb. 26, 2022
7.375% Senior Notes due 2020
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	7.375%
Debt Instrument, Maturity Date, Description	2020
7.125% Senior Notes due 2021
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	7.125%
Debt Instrument, Maturity Date, Description	2021
5% Senior Notes due 2022
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	5.00%
Debt Instrument, Maturity Date, Description	2022
3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	3.80%
Debt Instrument, Maturity Date, Description	2024
4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Debt Instrument, stated interest rate	4.90%
Debt Instrument, Maturity Date, Description	2044
Carrying Amount
Debt Instrument [Line Items]
Line of credit facility, amount outstanding	$ 1,225,000,000	165,000,000
Notes Payable	15,349,000	16,375,000
Carrying Amount \| 7.375% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes	196,278,000	195,997,000
Carrying Amount \| 7.125% Senior Notes due 2021
Debt Instrument [Line Items]
Senior notes	395,007,000	394,668,000
Carrying Amount \| 5% Senior Notes due 2022
Debt Instrument [Line Items]
Senior notes	1,996,664,000	1,996,507,000
Carrying Amount \| 3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Senior notes	989,431,000	988,940,000
Carrying Amount \| 4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Senior notes	$ 690,981,000	$ 690,912,000

Aggregate Amount of Lender Commitments on Credit Facility

No definition available.

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- Definition

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

+ References

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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-Publisher FASB

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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- Definition

Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

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-Name Accounting Standards Codification

-Topic 210

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

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- Definition

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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- Definition

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.

+ References

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- Definition

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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