Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Additional Information (Detail)

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Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
May 14, 2013
Sep. 30, 2012
Agreement
Jul. 27, 2011
Derivatives And Hedging Activities [Line Items]        
Number of interest rate swap agreements     2  
Notional amount of borrowings     $ 73.0  
Interest rate derivatives fixed interest rate   3.878%   3.878%
Nominal gain related to credit agreement $ 0.2