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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Goodwill And Other Intangible Assets [Line Items]        
Amortization expense of finite life intangible assets $ 2,160 $ 2,555    
Amortization expense of finite life intangibles for 2019 6,300      
Amortization expense of finite life intangibles for 2020 6,800      
Amortization expense of finite life intangibles for 2021 5,700      
Amortization expense of finite life intangibles for 2022 4,800      
Amortization expense of finite life intangibles for 2023 4,000      
Finite lived intangible assets 37,633 $ 45,288 $ 35,959 $ 49,956
Certain Tradenames [Member]        
Schedule Of Goodwill And Other Intangible Assets [Line Items]        
Finite lived intangible assets $ 3,900      
Finite lived intangible assets, useful life 10 years