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Goodwill and Intangible Assets - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Unit
Dec. 31, 2017
USD ($)
Unit
Dec. 31, 2016
USD ($)
Unit
Schedule Of Goodwill And Other Intangible Assets [Line Items]      
Aggregate amount of goodwill acquired $ 212,800 $ 242,300  
Aggregate amount of impairment $ 60,700 75,300  
Number of reporting units | Unit 3    
Goodwill, impairment loss $ 0 4,443 $ 53,800
Impairment of intangible assets   2,725  
Amortization expense of finite life intangible assets 9,600 $ 11,500 $ 13,900
Amortization expense of finite life intangibles for 2019 8,100    
Amortization expense of finite life intangibles for 2020 6,500    
Amortization expense of finite life intangibles for 2021 5,300    
Amortization expense of finite life intangibles for 2022 4,500    
Amortization expense of finite life intangibles for 2023 $ 3,600    
Four Reporting Units [Member]      
Schedule Of Goodwill And Other Intangible Assets [Line Items]      
Number of reporting units | Unit   4 4
Impairment of intangible assets   $ 2,700 $ 4,200