Basis and Summary of Significant Accounting Policies - Narrative (Details)	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) state	Sep. 30, 2017 USD ($)	Sep. 30, 2018 franchise state	Dec. 31, 2017 franchise
Significant Accounting Policies [Line Items]
Number of businesses acquired | franchise			8	4
Progressive Leasing
Significant Accounting Policies [Line Items]
Number of states in which entity operates | state	46		46
Progressive leasing invoice volume | $	$ 355,005	$ 281,724