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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill impairment $ 83,752,000 $ 110,387,000 $ 83,752,000 $ 110,387,000  
Finite lived intangible assets, amortization expense     23,000,000 22,600,000 22,400,000
Estimated amortization expense for the year 2014     14,500,000    
Estimated amortization expense for the year 2015     12,700,000    
Estimated amortization expense for the year 2016     11,200,000    
Estimated amortization expense for the year 2017     10,500,000    
Estimated amortization expense for the year 2018     8,900,000    
Estimated amortization expense after the year 2018     33,700,000    
Strategic Communications
          
Goodwill and Intangible Assets Disclosure [Line Items]          
Goodwill impairment     $ 83,752,000 $ 110,387,000