Long-Term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Loans Payable to Bank	$ 498,556	$ 498,274
Less: Current portion of long-term debt	(2,179)	(2,144)
Long-term debt, net of current portion	$ 7,149,279	7,115,644
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]
Revolving credit facility	$ 885,000	853,000
Loans Payable to Bank	498,556	498,274
Note payable	13,251	14,309
Total debt	7,151,458	7,117,788
Carrying Amount \| 7.375% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes	196,878	196,574
Carrying Amount \| 7.125% Senior Notes due 2021
Debt Instrument [Line Items]
Senior notes	395,732	395,365
Carrying Amount \| 5% Senior Notes due 2022
Debt Instrument [Line Items]
Senior notes	1,997,004	1,996,831
Carrying Amount \| 4 1/2% Senior Notes Due 2023
Debt Instrument [Line Items]
Senior notes	1,483,470	1,482,451
Carrying Amount \| 3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Senior notes	990,443	989,932
Carrying Amount \| 4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Senior notes	691,124	691,052
Estimated Fair Value
Debt Instrument [Line Items]
Revolving credit facility	885,000	853,000
Loans Payable to Bank	500,000	500,000
Note payable	12,000	12,500
Total debt	6,824,100	5,605,200
Estimated Fair Value \| 7.375% Senior Notes due 2020
Debt Instrument [Line Items]
Senior notes	206,000	179,200
Estimated Fair Value \| 7.125% Senior Notes due 2021
Debt Instrument [Line Items]
Senior notes	414,000	388,300
Estimated Fair Value \| 5% Senior Notes due 2022
Debt Instrument [Line Items]
Senior notes	1,940,000	1,480,400
Estimated Fair Value \| 4 1/2% Senior Notes Due 2023
Debt Instrument [Line Items]
Senior notes	1,398,800	1,061,000
Estimated Fair Value \| 3.8% Senior Notes due 2024
Debt Instrument [Line Items]
Senior notes	877,500	700,300
Estimated Fair Value \| 4.9% Senior Notes due 2044
Debt Instrument [Line Items]
Senior notes	$ 590,800	$ 430,500

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.

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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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