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Long-term Debt - Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long Term Debt	$ 1,946,761	$ 1,938,802
Less current maturities	(776)	(55,935)
Long-term debt, excluding current maturities	1,945,985	1,882,867
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long Term Debt		502,106
7 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Long Term Debt	400,000	400,000
5 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Long Term Debt	500,000	500,000
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Long Term Debt	535,000	535,000
5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Long Term Debt	510,000
Other notes with various rates and terms [Member]
Debt Instrument [Line Items]
Long Term Debt	$ 1,761	$ 1,696

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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