Annual report pursuant to Section 13 and 15(d)

Derivative Financial Instruments - Additional Information (Detail)

v2.4.0.6
Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Agreement
May 14, 2013
Jun. 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 0.1    
Fair value of the interest rate swap liability $ 0.1