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
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term Debt unsecured $ 900,000 $ 900,000
Debt premiums, net of amortization 16,537 17,611
Long-term debt secured 183,000 170,000
Total long-term debt 1,099,537 1,087,611
Current maturities of long-term debt      
Long-term debt, less current maturities $ 1,099,537 $ 1,087,611