Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Classes of Intangible Assets (Detail)

v3.10.0.1
Goodwill and Intangible Assets - Classes of Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Cost   $ 88,094
Indefinite-lived intangible assets, cost $ 14,559  
Accumulated Amortization 19,858 13,929
Net 125,470 74,165
Total intangible assets, gross (excluding goodwill) 159,887  
Intangible assets, net 140,029 $ 74,165
Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Amortization period   24 months
Cost 3,675 $ 3,000
Accumulated Amortization 3,042 3,000
Net $ 633 $ 0
Noncompete Agreements    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 24 months 36 months
Cost $ 27 $ 26
Accumulated Amortization 18 4
Net 9 22
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Cost 141,626 85,068
Accumulated Amortization 16,798 10,925
Net $ 124,828 $ 74,143
Minimum | Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 12 months  
Minimum | Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 156 months 156 months
Maximum | Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 24 months  
Maximum | Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 180 months 180 months