Summary of Significant Accounting Policies (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2016 region
Significant Accounting Policies [Line Items]
Number of independent regions acquired | region		6
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $	$ 6,300,000
RMCO, LLC
Significant Accounting Policies [Line Items]
Parent economic interest in RMCO (as a percent)	58.49%	58.43%