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Borrowings - Principal Repayments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Extinguishment of Debt [Line Items]    
2012 $ 53,203 $ 78,504
2013 389,114 304,645
2014 0 0
2015 0 0
2016 and beyond 933,871 932,089
Total $ 1,376,188 $ 1,315,238