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Significant Accounting Policies - Schedule of Amortizable Intangible Assets Amortized on Straight-line Basis over Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2018
Customer Relationships \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	3 years
Customer Relationships \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	14 years
Acquired Software \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	2 years
Acquired Software \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	7 years
Non-compete Agreements
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	5 years
Content Library
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	2 years
Other Trade Names \| Minimum
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	10 years
Other Trade Names \| Maximum
Finite Lived Intangible Assets [Line Items]
Amortizing intangible assets estimated useful lives	12 years