Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Dec. 16, 2019	Feb. 26, 2018	Nov. 15, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Jan. 01, 2019
Purchase Price Allocation
Goodwill				$ 150,684	$ 135,213	$ 159,038
Increase to goodwill				700
Pro Forma Information
Total revenue				287,394	205,059
Net income attributable to Holdings				$ 26,131	$ 7,628
Basic earnings per common share				$ 1.47	$ 0.43
Diluted earnings per common share				$ 1.47	$ 0.43
Booj Llc
Business Acquisition [Line Items]
Cash consideration		$ 26,300
Issuance of Class A common stock, equity-based compensation plans, value		10,000
Purchase Price Allocation
Cash		362
Other current assets		367
Property and equipment		625
Software		7,400
Trademarks		500
Non-compete agreement		1,200
Customer relationships		800
Other intangible assets		1,589
Other assets, net of current portion		336
Total assets acquired		13,179
Current portion of debt		(606)
Other current liabilities		557
Debt, net of current portion		(805)
Total liabilities assumed		1,968
Goodwill		15,039
Total purchase price		$ 26,250
First Leads
Business Acquisition [Line Items]
Cash consideration	$ 15,000
Marketing funds
Purchase Price Allocation
Restricted cash							$ 28,495
Other current assets							8,472
Property and equipment							788
Other assets, net of current portion							126
Total assets acquired							37,881
Other current liabilities							37,881
Total liabilities assumed							$ 37,881
Remax Of Northern Illinois Inc
Business Acquisition [Line Items]
Cash consideration			$ 35,700