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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Line Items]        
Goodwill impairment $ 83,752,000   $ 83,752,000  
Finite lived intangible assets, amortization expense 5,800,000 5,800,000 17,300,000 16,900,000
Estimated amortization expense during the remainder of 2013 5,700,000   5,700,000  
Estimated amortization expense for the year 2014 13,500,000   13,500,000  
Estimated amortization expense for the year 2015 11,800,000   11,800,000  
Estimated amortization expense for the year 2016 10,200,000   10,200,000  
Estimated amortization expense for the year 2017 9,500,000   9,500,000  
Estimated amortization expense for the year 2018 7,900,000   7,900,000  
Estimated amortization expense after the year 2018 28,500,000   28,500,000  
Strategic Communications
        
Goodwill and Intangible Assets Disclosure [Line Items]        
Goodwill impairment     $ 83,752,000