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Indebtedness - Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 2,350,000us-gaap_SubordinatedLongTermDebt	$ 2,640,516us-gaap_SubordinatedLongTermDebt
Total debt	3,073,000us-gaap_LongTermDebtNoncurrent	3,140,516us-gaap_LongTermDebtNoncurrent
Notes Payable to Banks \| 2.0% Bank Debt
Debt Instrument [Line Items]
Total debt	723,000	500,000
Senior Subordinated Notes \| 8.00% Notes Due 2019
Debt Instrument [Line Items]
Total debt		290,516
Senior Subordinated Notes \| 6.75% Notes Due 2020
Debt Instrument [Line Items]
Total debt	500,000	500,000
Senior Subordinated Notes \| 5.75% Notes Due 2021
Debt Instrument [Line Items]
Total debt	500,000	500,000
Senior Subordinated Notes \| 5.00% Notes Due 2022
Debt Instrument [Line Items]
Total debt	600,000	600,000
Senior Subordinated Notes \| 5.00% Notes Due 2023
Debt Instrument [Line Items]
Total debt	$ 750,000	$ 750,000

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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