Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Additional Information (Details)

v3.10.0.1
Goodwill and Intangible Assets - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Impairment of goodwill $ 0 $ 0 $ 0
Goodwill $ 58,332,000 56,135,000 57,976,000
Minimum      
Goodwill [Line Items]      
Percent of goodwill fair value that exceeds carrying value 20.00%    
Intangible assets amortization period 1 year    
Minimum | Customer contracts      
Goodwill [Line Items]      
Intangible assets amortization period 1 year    
Minimum | Customer relationships, noncompete agreements, technology and trade names      
Goodwill [Line Items]      
Intangible assets amortization period 4 years    
Maximum      
Goodwill [Line Items]      
Intangible assets amortization period 15 years    
Maximum | Customer contracts      
Goodwill [Line Items]      
Intangible assets amortization period 8 years    
Maximum | Customer relationships, noncompete agreements, technology and trade names      
Goodwill [Line Items]      
Intangible assets amortization period 15 years    
Canada      
Goodwill [Line Items]      
Goodwill $ 3,217,000 3,494,000 3,262,000
U.S. Regions      
Goodwill [Line Items]      
Goodwill $ 26,370,000 $ 24,759,000 $ 24,759,000