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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Goodwill and Intangible Assets Disclosure [Line Items]        
Finite lived intangible assets, amortization expense $ 5,800,000 $ 5,800,000 $ 16,948,000 $ 16,795,000
Estimated amortization expense for the remainder of year 2012 5,600,000   5,600,000  
Estimated amortization expense for the year 2013 20,400,000   20,400,000  
Estimated amortization expense for the year 2014 11,900,000   11,900,000  
Estimated amortization expense for the year 2015 10,900,000   10,900,000  
Estimated amortization expense for the year 2016 9,300,000   9,300,000  
Estimated amortization expense for the year 2017 8,600,000   8,600,000  
Estimated amortization expense after the year 2017 $ 31,800,000   $ 31,800,000