REVENUE - Schedule of Remaining Performance Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 1,463,368	$ 1,355,732
Revenue remaining performance obligation (in percent)	100.00%	100.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		$ 720,073
Revenue remaining performance obligation (in percent)		53.00%
Expected timing of satisfaction		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 795,595	$ 324,829
Revenue remaining performance obligation (in percent)	54.00%	24.00%
Expected timing of satisfaction	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 358,795	$ 174,001
Revenue remaining performance obligation (in percent)	25.00%	13.00%
Expected timing of satisfaction	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 194,280	$ 136,829
Revenue remaining performance obligation (in percent)	13.00%	10.00%
Expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 114,698
Revenue remaining performance obligation (in percent)	8.00%
Expected timing of satisfaction
Maintenance
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 374,554	$ 350,628
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		242,073
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	245,271	66,207
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	67,720	26,746
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	37,142	15,602
Maintenance | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	24,421
Pega Cloud
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	960,264	885,688
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		379,648
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	446,160	246,195
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	279,474	143,901
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	144,453	115,944
Pega Cloud | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	90,177
Subscription license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	81,097	71,461
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		60,668
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	62,070	3,803
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	9,138	1,707
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	9,789	5,283
Subscription license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	100
Perpetual license
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,727	7,563
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		5,310
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,284	2,253
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	443	0
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0	0
Perpetual license | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	0
Consulting
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	44,726	40,392
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation		32,374
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	39,810	6,371
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,020	1,647
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	2,896	$ 0
Consulting | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01
Disaggregation of Revenue [Line Items]
Revenue remaining performance obligation	$ 0