Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 51,350,000	$ 43,979,000	$ 28,252,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	15,124,000	15,316,000	15,166,000
Bad debt expense	433,000	630,000	604,000
(Gain) loss on sale or disposition of assets, net	(3,397,000)	(14,000)	373,000
Loss on early extinguishment of debt	94,000	178,000	1,798,000
Equity in earnings of investees	(1,215,000)	(600,000)	(904,000)
Distributions received from equity investees	1,178,000	549,000	1,162,000
Equity-based compensation expense	1,453,000	2,002,000	2,995,000
Non-cash interest expense	439,000	365,000	859,000
Deferred income tax expense	2,531,000	1,865,000	402,000
Changes in operating assets and liabilities:
Accounts and notes receivable, current portion	(999,000)	(1,466,000)	(585,000)
Advances from/to affiliates	(771,000)	(161,000)	57,000
Other current and noncurrent assets	502,000	100,000	(1,245,000)
Other current and noncurrent liabilities	7,000,000	858,000	1,574,000
Deferred revenue and deposits current portion	866,000	1,094,000	(439,000)
Payment pursuant to Tax Receivable Agreement	0	(986,000)
Net cash provided by operating activities	74,588,000	63,709,000	50,069,000
Cash flows from investing activities:
Purchase of property, equipment and software	(3,546,000)	(2,026,000)	(1,108,000)
Proceeds from sale of property and equipment	25,000	5,000	18,000
Capitalization of trademark costs	(82,000)	(122,000)	(232,000)
Acquisitions			(27,305,000)
Disposition	5,650,000	100,000
Cost to sell assets	(383,000)
Net cash used in investing activities	1,664,000	(2,043,000)	(28,627,000)
Cash flows from financing activities:
Proceeds from issuance of debt			230,000,000
Payments on debt	(9,400,000)	(16,816,000)	(234,658,000)
Debt issuance costs and capitalized debt amendment costs	(555,000)		(1,345,000)
Proceeds from issuance of Class A common stock in initial public offering			235,922,000
Payments of costs directly associated with issuance of Class A common stock			(5,972,000)
Purchase of Common Units from RMCO, LLC			(197,618,000)
Distributions to non-controlling unitholders	(42,827,000)	(22,197,000)	(27,614,000)
Dividends paid to Class A common stockholders	(24,003,000)	(2,901,000)
Proceeds from exercise of stock options	(322,000)	(204,000)	(266,000)
Payments on capital lease obligations	2,248,000	486,000
Excess tax benefit realized on exercise of stock options and delivery of vested restricted stock units	2,770,000	736,000
Cancellation of vested restricted stock units for required tax withholding payments	(327,000)	(1,781,000)
Net cash used in financing activities	(72,416,000)	(42,677,000)	(1,551,000)
Effect of exchange rate changes on cash	(823,000)	(165,000)	(17,000)
Net (decrease) increase in cash and cash equivalents	3,013,000	18,824,000	19,874,000
Cash and cash equivalents, beginning of year	107,199,000	88,375,000	68,501,000
Cash and cash equivalents, end of period	110,212,000	107,199,000	88,375,000
Supplemental disclosures of cash flow information:
Cash paid for interest and for debt amendment costs	9,319,000	8,880,000	13,769,000
Net cash paid for income taxes	5,841,000	8,521,000	2,310,000
Schedule of non-cash investing and financing activities:
Establishment of deferred tax assets	43,774,000	917,000	69,711,000
Establishment of amounts payable under tax receivable agreements	33,018,000	436,000	68,840,000
Tax distributions payable to non-controlling unitholders			2,552,000
Note receivable received as consideration for sale of brokerage operations assets	851,000
Capital leases for property and equipment	412,000	18,000	581,000
Increase in accounts payable for capitalization of trademark costs and purchases of property, equipment and software	$ 667,000	$ 165,000	$ 78,000