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BUSINESS COMBINATIONS - Narrative (Details)
$ / shares in Units, $ in Thousands, € in Millions, £ in Millions, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Oct. 19, 2018
USD ($)
$ / shares
shares
Sep. 29, 2017
USD ($)
$ / shares
Mar. 24, 2017
USD ($)
Mar. 24, 2017
GBP (£)
Feb. 08, 2017
USD ($)
Feb. 08, 2017
CAD ($)
Nov. 03, 2016
USD ($)
Nov. 03, 2016
EUR (€)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 24, 2017
GBP (£)
Feb. 08, 2017
CAD ($)
Business Acquisition                                          
Severance costs                                 $ 19,800        
Revenue                 $ 278,992 $ 303,116 $ 294,822 $ 255,311 $ 223,213 $ 181,717 $ 180,711 $ 150,745 1,132,241 $ 736,386 $ 498,890    
Handy                                          
Business Acquisition                                          
Proportion of voting interests acquired (as a percent) 100.00%                                        
Consideration transferred $ 165,500                                        
Common stock issued (shares) | shares 8.6                                        
Common stock $ 165,800                                        
Share price (USD per share) | $ / shares $ 19.31                                        
Contingently issuable stock in escrow (shares) | shares 1.1                                        
Indemnification assets established $ 14,300                                        
Angie's List                                          
Business Acquisition                                          
Proportion of voting interests acquired (as a percent)   100.00%                                      
Consideration transferred   $ 781,384                                      
Share price (USD per share) | $ / shares   $ 12.46                                      
Cash acquisition price   $ 1,900                             12,064 35,621      
Cash paid to holders of acquiree common stock (in dollars per share) | $ / shares   $ 8.50                                      
Revenue                                   58,900      
Net earnings                                   21,700      
Severance costs                                   19,800      
Write-off due to deferred revenue                                 $ 5,500 7,800      
HomeStars                                          
Business Acquisition                                          
Proportion of voting interests acquired (as a percent)         90.00%                               90.00%
Cash acquisition price         $ 12,700 $ 16.6                              
Working capital adjustment         $ 200                               $ 0.3
Proportion of noncontrolling interests (as a percent)         10.00% 10.00%                              
Fair value at acquisition         $ 1,400 $ 1.9                              
Enterprise value of business using purchase price (as a percent)         100.00% 100.00%                              
Revenue                                   6,500      
Net income (loss)                                   (1,200)      
MyBuilder                                          
Business Acquisition                                          
Proportion of voting interests acquired (as a percent)     75.00%                                 75.00%  
Cash acquisition price     $ 40,700 £ 32.6                                  
Working capital adjustment     $ 800                                 £ 0.6  
Proportion of noncontrolling interests (as a percent)     25.00% 25.00%                                  
Fair value at acquisition     $ 13,300 £ 10.7                                  
Enterprise value of business using purchase price (as a percent)     100.00% 100.00%                                  
Revenue                                   8,000      
Net income (loss)                                   (1,400)      
MyHammer                                          
Business Acquisition                                          
Proportion of voting interests acquired (as a percent)             70.00% 70.00%                          
Consideration transferred             $ 19,700 € 17.7                          
Proportion of noncontrolling interests (as a percent)             30.00% 30.00%                          
Fair value at acquisition             $ 10,400 € 9.4                          
Ownership proportion (as a percent)                 83.00%               83.00%        
Revenue                                   12,700      
Net income (loss)                                   100      
Acquisition-related Costs                                          
Business Acquisition                                          
Severance costs                                   28,700      
Adjustment to decrease transaction related costs                                 $ 4,600 35,200      
Modification of Equity Awards                                          
Business Acquisition                                          
Adjustment to decrease stock-based compensation                                   (77,200)      
Amortization Adjustment                                          
Business Acquisition                                          
Adjustment to decrease amortization of intangible assets                                 $ 2,500 $ 39,100