Annual report pursuant to Section 13 and 15(d)

Schedule of Long-Term Debt (Detail)

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Schedule of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term Debt unsecured $ 900,000 $ 900,000
Debt premiums, net of amortization 15,421 17,611
Long-term debt secured 290,000 170,000
Total long-term debt 1,205,421 [1] 1,087,611 [1]
Current maturities of long-term debt      
Long-term debt, less current maturities $ 1,205,421 $ 1,087,611
[1] Aggregate annual maturities of long-term debt as of December 31, 2013 are as follows (in millions): 2014–$0.0; 2015–$0.0; 2016–$0.0; 2017–$0.0; thereafter–$1,190.0.