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Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Customer Relationships Acquired (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Minimum
Goodwill And Intangible Assets [Line Items]
Discount rates	19.00%	19.00%	20.00%
Customer attrition rates	10.00%	5.00%	20.00%
Maximum
Goodwill And Intangible Assets [Line Items]
Discount rates	25.00%	24.00%	27.00%
Customer attrition rates	43.00%	37.00%	33.00%
Weighted Average
Goodwill And Intangible Assets [Line Items]
Discount rates	20.00%	24.00%	25.00%
Customer attrition rates	13.00%	6.00%	22.00%

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- Definition

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- Definition

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