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Intangible Assets - Narrative (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Amortization of Intangible Assets $ 1,800 $ 2,000  
Historical Cost 63,811   $ 63,811
Accumulated Amortization (43,301)   (39,731)
Net Balance $ 20,510   24,080
Customer relationships      
Finite-Lived Intangible Assets [Line Items]      
Useful Life 9 years 4 months 24 days    
Historical Cost $ 56,453   56,453
Accumulated Amortization (38,487)   (35,469)
Net Balance $ 17,966   20,984
Tradenames and trademarks      
Finite-Lived Intangible Assets [Line Items]      
Useful Life 7 years 5 months    
Historical Cost $ 6,786   6,786
Accumulated Amortization (4,543)   (4,029)
Net Balance $ 2,243   2,757
Other Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Useful Life 6 years    
Historical Cost $ 572   572
Accumulated Amortization (271)   (233)
Net Balance $ 301   $ 339