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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]        
Goodwill impairment charge       $ 83,752
Amortization of other intangible assets   $ 11,726 $ 15,521 $ 22,954
Estimated amortization expense for the year 2016   10,500    
Estimated amortization expense for the year 2017   9,700    
Estimated amortization expense for the year 2018   8,100    
Estimated amortization expense for the year 2019   7,500    
Estimated amortization expense for the year 2020   7,300    
Estimated amortization expense after the year 2020   $ 15,200    
Strategic Communications        
Finite Lived Intangible Assets [Line Items]        
Goodwill impairment charge $ 83,800