Summary of Significant Accounting Policies - Property and Equipment Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Minimum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Minimum | Service equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Minimum | Furniture, office equipment, signs and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum | Buildings and improvements
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Maximum | Service equipment
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Maximum | Furniture, office equipment, signs and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years