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Commitments and Contingencies - Additional Information (Detail)
Jun. 20, 2017
USD ($)
Feb. 09, 2017
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2018
claim
Feb. 28, 2018
claim
Feb. 05, 2018
claim
Other Commitments [Line Items]              
Outstanding letters of credit     $ 16,900,000        
Outstanding surety bonds     9,800,000 $ 10,200,000      
VHT Vs Zillow Group Inc.              
Other Commitments [Line Items]              
Jury awarded damages $ 4,100,000            
VHT Vs Zillow Group Inc. | Actual Damages              
Other Commitments [Line Items]              
Jury awarded damages   $ 79,875          
VHT Vs Zillow Group Inc. | Statutory Damages              
Other Commitments [Line Items]              
Jury awarded damages   $ 8,200,000          
Class Action Lawsuits              
Other Commitments [Line Items]              
Number of pending claims | claim         2    
Shareholder Derivative Lawsuits              
Other Commitments [Line Items]              
Number of pending claims | claim           4 2
Homes under contract to purchase that have not closed              
Other Commitments [Line Items]              
Value of homes under contract that have not closed     $ 51,900,000