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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill [Line Items]        
Proceeds from sale of business     $ 50,283 $ 0
Goodwill written off     20,928  
Amortization of other intangible assets $ 1,975 $ 2,882 6,297 $ 7,797
Technology        
Goodwill [Line Items]        
Proceeds from sale of business $ 50,300      
Goodwill written off     $ 20,928