REVENUE - Schedule of Revenue Streams (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 420,716	$ 384,512	$ 850,689	$ 860,145
Pega Cloud
Disaggregation of Revenue [Line Items]
Total revenue	213,934	166,743	418,965	317,866
Maintenance
Disaggregation of Revenue [Line Items]
Total revenue	74,528	79,271	149,845	155,639
Consulting
Disaggregation of Revenue [Line Items]
Total revenue	50,226	57,824	104,999	118,245
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	370,490	326,688	745,690	741,900
Subscription services
Disaggregation of Revenue [Line Items]
Total revenue	288,462	246,014	568,810	473,505
Subscription license
Disaggregation of Revenue [Line Items]
Total revenue	82,028	80,674	176,880	268,395
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue	338,688	303,838	673,809	591,750
Revenue recognized over time \| Pega Cloud
Disaggregation of Revenue [Line Items]
Total revenue	213,934	166,743	418,965	317,866
Revenue recognized over time \| Maintenance
Disaggregation of Revenue [Line Items]
Total revenue	74,528	79,271	149,845	155,639
Revenue recognized over time \| Consulting
Disaggregation of Revenue [Line Items]
Total revenue	50,226	57,824	104,999	118,245
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	82,028	80,674	176,880	268,395
Revenue recognized at a point in time \| Subscription license
Disaggregation of Revenue [Line Items]
Total revenue	$ 82,028	$ 80,674	$ 176,880	$ 268,395