Quarterly report pursuant to Section 13 or 15(d)

Schedule of Long-Term Debt (Detail)

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Schedule of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term Debt unsecured $ 900,000 $ 900,000
Debt premiums, net of amortization 14,847 15,421
Long-term debt secured 279,000 290,000
Total long-term debt 1,193,847 1,205,421
Current maturities of long-term debt      
Long term debt, less current maturities $ 1,193,847 $ 1,205,421