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Maturities of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Long-Term Debt And Capital Lease Obligations [Line Items]  
Long term Debt, 2013 $ 6,000
Long term Debt, 2014 6,000
Long term Debt, 2015 11,000
Long term Debt, 2016   
Long term Debt, 2017   
Long term Debt, Thereafter 700,000
Debt instrument, carrying amount 723,000
Capital Lease Obligations, 2013 21
Capital Lease Obligations, 2014 24
Capital Lease Obligations, 2015   
Capital Lease Obligations, 2016   
Capital Lease Obligations, Thereafter   
Capital Lease Obligations, Including imputed interest 45
Long term debt and capital lease obligations maturities, 2013 6,021
Long term debt and capital lease obligations maturities, 2014 6,024
Long term debt and capital lease obligations maturities, 2015 11,000
Long term debt and capital lease obligations maturities, 2016   
Long term debt and capital lease obligations maturities, Thereafter 700,000
Long term debt and capital lease obligation, including imputed interest $ 723,045