Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Additional Information (Detail)

v2.4.0.6
Fair Value of Financial Instruments - Additional Information (Detail) (Significant Other Observable Inputs (Level 2) [Member], Maximum [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Significant Other Observable Inputs (Level 2) [Member] | Maximum [Member]
   
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Carrying amount of interest rate swap agreements $ 0.1 $ 0.1