Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Loans Payable to Bank	$ 499,020	$ 498,865
Less: Current portion of long-term debt	(2,236)	(2,219)
Long-term debt, net of current portion	$ 6,508,209	6,577,697
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]
Revolving credit facility	$ 835,000	905,000
Loans Payable to Bank	499,020	498,865
Note payable	11,631	12,176
Total debt	6,510,445	6,579,916
Carrying Amount \| 5% Senior Notes due 2022
Debt Instrument [Line Items]
Senior notes	1,997,280	1,997,188
Carrying Amount \| 4 1/2% Senior Notes Due 2023
Debt Instrument [Line Items]
Senior notes	1,485,049	1,484,524
Carrying Amount \| 3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Senior notes	991,228	990,964
Carrying Amount \| 4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Senior notes	691,237	691,199
Estimated Fair Value
Debt Instrument [Line Items]
Revolving credit facility	835,000	905,000
Loans Payable to Bank	500,000	500,000
Note payable	9,700	10,200
Total debt	6,361,900	6,447,400
Estimated Fair Value \| 5% Senior Notes due 2022
Debt Instrument [Line Items]
Senior notes	2,019,500	2,020,400
Estimated Fair Value \| 4 1/2% Senior Notes Due 2023
Debt Instrument [Line Items]
Senior notes	1,465,600	1,474,800
Estimated Fair Value \| 3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Senior notes	930,900	929,400
Estimated Fair Value \| 4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Senior notes	$ 601,200	$ 607,600

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

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts 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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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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