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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]        
Amortization of other intangible assets $ 2,900 $ 3,400 $ 8,919 $ 11,466
Estimated amortization expense during the remainder of 2015 2,900   2,900  
Estimated amortization expense for the year 2016 10,500   10,500  
Estimated amortization expense for the year 2017 9,800   9,800  
Estimated amortization expense for the year 2018 8,200   8,200  
Estimated amortization expense for the year 2019 7,600   7,600  
Estimated amortization expense for the year 2020 7,400   7,400  
Estimated amortization expense after the year 2020 $ 15,300   $ 15,300