Stock-based Compensation - Equity Awards (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
		Jan. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised			$ 3,000
Option, unrecognized stock-based compensation expense			18,400
Stock-based compensation expense, including cash settled	[1]		268,261	$ 202,999
Restricted Stock Units | Qualtrics RSU Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of RSUs that vested			529,800	50,200
Unrecognized stock-based compensation expense			$ 2,674,000
Period for recognition (in years)			2 years 10 months 24 days
Qualtrics options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)			2 years
Employee Stock | Qualtrics Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum contribution percentage (per period)		1.00%
Maximum contribution percentage (per period)		20.00%
Purchase price of common stock, percent of market price		85.00%
Maximum value of shares per employee		$ 15
Stock-based compensation expense, including cash settled			$ 5,100	$ 2,900

[1] During the three months ended March 31, 2022, employer payroll tax on employee stock transactions reported in cost of subscription revenue, cost of professional services and other revenue, research and development, sales and marketing, and general and administrative expense was $0.3 million, $0.4 million, $3.2 million, $2.1 million, and $6.0 million, respectively. Employer payroll tax on employee stock transactions was not material during the three months ended March 31, 2021.