Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Additional Information (Detail)

v2.4.0.6
Derivative Instruments - Additional Information (Detail) (Fair value of interest rate swaps, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 27, 2013
Derivative [Line Items]    
Interest rate swap agreement, notional principal amount   $ 150.0
Payments swap LIBOR floor rate 0.625%  
Interest rate swap, expiration date Mar. 28, 2019  
Interest rate swap, fixed rate 1.685%  
Level 2
   
Derivative [Line Items]    
Change in fair value of the interest rate swap agreement liability 0.4