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Goodwill and Other Intangible Assets - Intangible Assets by Major Class (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets, Weighted Average Useful Life in Years 14 years 2 months 12 days  
Amortized intangible assets, Gross Carrying Amount $ 102,187 $ 120,456
Amortized intangible assets, Accumulated Amortization 72,654 81,906
Amortized intangible assets, Net Carrying Amount 29,533 38,550
Intangible assets, Gross Carrying Amount 107,287 126,056
Intangible assets, Net Carrying Amount 34,633 44,150
Trade names (1)    
Finite-Lived Intangible Assets [Line Items]    
Unamortized intangible assets, Gross Carrying Amount $ 5,100 5,600
Customer relationships (1)    
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets, Weighted Average Useful Life in Years 14 years 3 months 18 days  
Amortized intangible assets, Gross Carrying Amount $ 99,080 117,192
Amortized intangible assets, Accumulated Amortization 71,036 80,523
Amortized intangible assets, Net Carrying Amount $ 28,044 36,669
Acquired software    
Finite-Lived Intangible Assets [Line Items]    
Amortized intangible assets, Weighted Average Useful Life in Years 9 years 9 months 18 days  
Amortized intangible assets, Gross Carrying Amount $ 3,107 3,264
Amortized intangible assets, Accumulated Amortization 1,618 1,383
Amortized intangible assets, Net Carrying Amount $ 1,489 $ 1,881