Intangible Assets - Summary of Intangible Assets (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Total	$ 318,344
Customer Contracts and Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	339,760
Accumulated Amortization	21,416
Total	$ 318,344
Weighted average useful life	11 years
Customer Contracts and Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life	7 years
Customer Contracts and Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life	13 years