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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization of other intangible assets $ 2,845 $ 2,900 $ 8,041 $ 8,919
Estimated amortization expense during the remainder of 2016 2,500   2,500  
Estimated amortization expense for the year 2017 9,400   9,400  
Estimated amortization expense for the year 2018 7,800   7,800  
Estimated amortization expense for the year 2019 7,200   7,200  
Estimated amortization expense for the year 2020 7,000   7,000  
Estimated amortization expense for the year 2021 6,500   6,500  
Estimated amortization expense after the year 2021 $ 8,500   $ 8,500