Summary of Significant Accounting Policies - Amortized Finite-Lived Intangible Assets Estimated Useful lives (Details)	12 Months Ended
	Dec. 31, 2018
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	6 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Trade names | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	5 years
Trade names | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	8 years