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Derivative Instruments And Hedging Activities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended 9 Months Ended
Dec. 31, 2012
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2014
Twenty Ten Senior Notes [Member]
Sep. 30, 2014
Two Thousand Fourteen Senior Notes Five Year [Member]
Sep. 30, 2014
Interest Income Expense Net [Member]
Derivative [Line Items]                  
Derivative Notional Amount             $ 250.0 $ 250.0  
Floating interest rate base 3-month LIBOR           3-month LIBOR 3-month LIBOR  
Gain Due To Termination Of Swap                 4.0
Accumulated Other Comprehensive Income Loss Net Of Tax $ (82.1) $ (133.6) $ (47.3) $ (54.6) $ (100.2) $ (149.9)