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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Goodwill [Line Items]    
Amortization of intangible assets $ 11,793 $ 11,338
Acquired Intangible Assets [Member]    
Goodwill [Line Items]    
Amortization of intangible assets 8,700 9,200
Capitalized Software [Member]    
Goodwill [Line Items]    
Amortization of intangible assets $ 3,100 $ 2,100