Acquisitions - Significant Estimates Used by Management in Determining Fair Values of Customer Relationships Acquired (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Minimum
Goodwill And Intangible Assets [Line Items]
Discount rates	18.00%	19.00%
Customer attrition rates	8.00%	10.00%
Maximum
Goodwill And Intangible Assets [Line Items]
Discount rates	26.00%	25.00%
Customer attrition rates	30.00%	43.00%
Weighted Average
Goodwill And Intangible Assets [Line Items]
Discount rates	18.00%	20.00%
Customer attrition rates	10.00%	13.00%