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GOODWILL, TRADE NAMES, AND OTHER INTANGIBLE ASSETS - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Sep. 30, 2021
segment
Sep. 30, 2020
USD ($)
$ / shares
Dec. 31, 2019
Goodwill [Line Items]          
Number of reportable segments | segment     2    
Trade Names          
Goodwill [Line Items]          
Weighted average amortization period if not accelerated         7 years 6 months
Impact of accelerated amortization on earnings per share (in dollars per share) | $ / shares $ 0.03     $ 0.09  
Accelerated Amortization | Trade Names          
Goodwill [Line Items]          
Amortization of intangible assets $ 0.9     $ 3.1  
Search Services          
Goodwill [Line Items]          
Impairment charges for goodwill   $ 10.2      
Search Services | Customer relationships          
Goodwill [Line Items]          
Impairment charges for intangible assets   $ 0.3