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Aggregate Payments of Principal on Long-Term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Debt Instrument [Line Items]  
Long term debt maturities repayments of principal in year 2012 $ 119,452
2014 311,208
2015 246,054
2016 310,725
2017 207,592
Long term debt maturities repayments of principal thereafter 979,572
Net unamortized premiums 17,765
Long term debt maturities repayments of principal $ 2,192,368