Debt and Other Financing Arrangements - Schedule of Debt and Other Financing Arrangements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt	$ 4,376,935us-gaap_LongTermDebt	$ 4,380,200us-gaap_LongTermDebt
Long-term Debt	4,376,935us-gaap_LongTermDebt	4,380,200us-gaap_LongTermDebt
Less current maturities	(16,335)us-gaap_LongTermDebtCurrent	(3,300)us-gaap_LongTermDebtCurrent
Long-term Debt due after one year	4,360,600us-gaap_LongTermDebtNoncurrent	4,376,900us-gaap_LongTermDebtNoncurrent
Notes, 5.75%, Due 2017 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	600,000	600,000
Notes, 5.85%, Due 2018 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	500,000	500,000
Notes, 4.125%, Due 2022 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	600,000	600,000
Notes, 4.0%, Due 2023 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	500,000	500,000
Notes, 6.40%, Due 2037 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	650,000	650,000
Notes, 5.20%, Due 2043 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	500,000	500,000
Industrial Revenue Bonds [Member] \| 0.17% to 0.24%, variable, due from 2015 to 2040 [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 1,026,935	$ 1,030,200

Face (par) amount of debt instrument at time of issuance.

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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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