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Details of Indebtedness (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Indebtedness [Line Items]    
Debts swapped to fixed rates with notional amounts $ 269.4 $ 124.3
Debt settlement start year 2015  
Debt maturity range start year 2016  
Debt maturity range end year 2019