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Business Combinations - Estimates of Acquired Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Fair Value $ 7,100 $ 6,481
Weighted Average Estimated Useful Life (yrs) 8 years 8 years
Trademarks and Trade Names [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Fair Value $ 1,999 $ 2,740
Weighted Average Estimated Useful Life (yrs) 15 years 15 years
Covenants Not-to-Compete [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Fair Value $ 1,023 $ 650
Weighted Average Estimated Useful Life (yrs) 5 years 5 years