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Restructuring - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2012
2012 Plan
Mar. 31, 2012
2012 Plan
Dec. 31, 2012
2012 Plan
Dec. 31, 2012
2010 Plan
Jun. 30, 2012
2010 Plan
Dec. 31, 2010
2010 Plan
Dec. 31, 2011
2010 Plan
Dec. 31, 2010
2010 Plan
Workforce Reduction
Restructuring Cost and Reserve [Line Items]                      
Restructuring accrual $ 1.0   $ 0.1 $ 1.0   $ 1.0     $ 2.3 $ 0.1  
Severance costs       0.6 0.9            
Restructuring charges related to a global reduction in force 1.4 4.4       (1.5) 0.1   (4.0)   4.0
Released remaining restructuring cost               0.1      
Restructuring charges                 $ 0.4