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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Amortization expense of finite life intangible assets $ 2,200 $ 2,300 $ 6,479 $ 7,355    
Amortization expense of finite life intangibles for 2019 1,900   1,900      
Amortization expense of finite life intangibles for 2020 6,800   6,800      
Amortization expense of finite life intangibles for 2021 5,700   5,700      
Amortization expense of finite life intangibles for 2022 4,800   4,800      
Amortization expense of finite life intangibles for 2023 4,000   4,000      
Finite lived intangible assets 33,252 $ 38,548 33,252 $ 38,548 $ 35,959 $ 49,956
Certain Tradenames [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Finite lived intangible assets $ 3,900   $ 3,900      
Finite lived intangible assets, useful life     10 years