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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Goodwill and Intangible Assets Disclosure [Line Items]        
Finite lived intangible assets, amortization expense $ 6.0 $ 5.7 $ 11.5 $ 11.2
Estimated amortization expense during the remainder of 2013 10.8   10.8  
Estimated amortization expense for the year 2014 13.2   13.2  
Estimated amortization expense for the year 2015 12.2   12.2  
Estimated amortization expense for the year 2016 10.7   10.7  
Estimated amortization expense for the year 2017 9.9   9.9  
Estimated amortization expense for the year 2018 8.6   8.6  
Estimated amortization expense after the year 2018 $ 30.7   $ 30.7