Earnings Per Share - Schedule of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 528	$ 3,411
Less: Net income attributable to non-controlling interests	130
Net income attributable to Clearwater Analytics Holdings, Inc. - basic	398
Reallocation of net Income attributable to non-controlling interests from the assumed exchange of Class B and Class C stock for Class A and Class D stock	130
Net income attributable to Clearwater Analytics Holdings, Inc. - diluted	528
Numerator:
Allocation of net Income attributable to Clearwater Analytics, Inc.	$ 398
Denominator:
Weighted average number of shares of Class A and Class D common stock outstanding - basic	178,517,480
Denominator:
Basic	178,517,480
Add: weighted-average effect of dilutive securities exchangeable for Class A common stock:
Weighted average number of shares of Class A and Class D common stock outstanding - diluted	246,916,663
Class A
Numerator:
Allocation of net Income attributable to Clearwater Analytics, Inc.	$ 108
Denominator:
Weighted average number of shares of Class A and Class D common stock outstanding - basic	48,433,725
Basic net Income per share attributable to Class and Class D common stockholders	$ 0.00
Numerator:
Undistributed earnings for basic computation	$ 108
Reallocation of Income as a result of conversion of Class B to Class A shares and conversion Class C to Class D shares	25
Reallocation of Income as a result of conversion of Class D to Class A shares	395
Allocation of undistributed income	$ 528
Denominator:
Basic	48,433,725
Add: weighted-average effect of dilutive securities exchangeable for Class A common stock:
Conversion of Class B stock to Class A stock, and conversion of Class C stock to Class D stock	11,151,110
Conversion of Class D to Class A common stock outstanding	177,461,342
Weighted average number of shares of Class A and Class D common stock outstanding - diluted	246,916,663
Diluted net income per share attributable to Class A and Class D common stockholders	$ 0.00
Class A | Stock options of Clearwater Analytics Holdings, Inc.
Add: weighted-average effect of dilutive securities exchangeable for Class A common stock:
Weighted-average effect of dilutive securities exchangeable for Class A common stock	8,763,651
Class A | RSUs of Clearwater Analytics Holdings, Inc.
Add: weighted-average effect of dilutive securities exchangeable for Class A common stock:
Weighted-average effect of dilutive securities exchangeable for Class A common stock	1,106,835
Class D
Numerator:
Allocation of net Income attributable to Clearwater Analytics, Inc.	$ 290
Denominator:
Weighted average number of shares of Class A and Class D common stock outstanding - basic	130,083,755
Basic net Income per share attributable to Class and Class D common stockholders	$ 0.00
Numerator:
Undistributed earnings for basic computation	$ 290
Reallocation of Income as a result of conversion of Class B to Class A shares and conversion Class C to Class D shares	105
Allocation of undistributed income	$ 395
Denominator:
Basic	130,083,755
Add: weighted-average effect of dilutive securities exchangeable for Class A common stock:
Conversion of Class B stock to Class A stock, and conversion of Class C stock to Class D stock	47,377,587
Weighted average number of shares of Class A and Class D common stock outstanding - diluted	177,461,342
Diluted net income per share attributable to Class A and Class D common stockholders	$ 0.00