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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful life 80 months  
Amortizable intangible assets, net $ 89,499 $ 114,290
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful life 80 months  
Amortizable intangible assets, net $ 78,527 98,484
Accumulated amortization of intangible assets $ 53,926 33,968
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful life 92 months  
Amortizable intangible assets, net $ 8,326 10,868
Accumulated amortization of intangible assets $ 8,367 5,825
Computer software    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining useful life 17 months  
Amortizable intangible assets, net $ 2,646 4,938
Accumulated amortization of intangible assets $ 2,741 $ 15,420