Segment Information - Adjusted EBITDA (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total segment reporting adjusted EBITDA	$ 91,401	$ 83,805	$ 77,039
Real Estate Franchise Services
Segment Reporting Information [Line Items]
Total segment reporting adjusted EBITDA	89,280	83,227	75,490
Brokerages
Segment Reporting Information [Line Items]
Total segment reporting adjusted EBITDA	$ 2,121	$ 578	$ 1,549