Restructuring and Zillow Offers Wind Down - Restructuring Reserve (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 0
Additions charged to expense	63,363
Cash payments	(14,408)
Balance, end of period	48,955
Employee Termination Costs
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0
Additions charged to expense	54,339
Cash payments	(9,160)
Balance, end of period	45,179
Contract Termination Costs
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0
Additions charged to expense	9,024
Cash payments	(5,248)
Balance, end of period	$ 3,776