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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
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill $ 129,705   $ 129,705 $ 123,031
Total other intangible assets, net 102,437   102,437 $ 100,935
Amortization expense of intangible assets 3,238 $ 3,029 8,905  
Estimated Future Amortization Expense by Fiscal Year [Abstract]        
Remainder of 2015 3,200   3,200  
2016 12,800   12,800  
2017 12,500   12,500  
2018 10,500   10,500  
2019 8,800   8,800  
2020 4,000   4,000  
After 2020 $ 1,900   $ 1,900