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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Long Term Debt (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Debt Instrument
Total debt	$ 1,618,275,000	$ 1,030,921,000	$ 1,113,361,000
Less: Current maturities	(14,331,000)	(12,403,000)	(6,169,000)
Long-term debt	1,603,944,000	1,018,518,000	1,107,192,000
6.6% Senior Notes, Due 2018
Debt Instrument
Total debt	299,063,000	298,893,000	298,837,000
7% Debentures, Due 2025
Debt Instrument
Total debt	124,493,000	124,471,000	124,464,000
6.25% Senior Notes, Due 2037
Debt Instrument
Total debt	228,175,000	228,148,000	228,139,000
4.25% Senior Notes, Due 2024
Debt Instrument
Total debt	395,211
Floating Rate Notes, Due 2017
Debt Instrument
Total debt	298,760,000
Term Loan Facility, Due 2018
Debt Instrument
Total debt	239,304,000	248,441,000	240,000,000
Trade Receivable Credit Facility
Debt Instrument
Credit Facility	30,000,000	130,000,000	150,000,000
Other notes
Debt Instrument
Other notes	3,269,000	968,000	1,921,000
Revolving Facility
Debt Instrument
Credit Facility			$ 70,000,000