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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Unbilled Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Receivables [Abstract] |  |
1 year or less | $ 207,155 | $ 180,219
1-2 years | 83,992 |
2-5 years | 29,286 |
Total | $ 320,433 |
Percentage of unbilled receivables, 1 Year or Less | 65.00% |
Percentage of unbilled receivables, 1-2 Years | 26.00% |
Percentage of unbilled receivables, 2-5 Years | 9.00% |
Total percentage of unbilled receivables | 100.00% |

X
- Definition Unbilled Receivables Current and Non Current + References No definition available. + Details
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Namespace Prefix: | pega_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unbilled receivables current and non current percentage. + References No definition available. + Details
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Namespace Prefix: | pega_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Unbilled receivables not billable at balance sheet date amount expected to be collected within year one and two. + References No definition available. + Details
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Namespace Prefix: | pega_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unbilled receivables not billable at balance sheet date amount expected to be collected within year two and five. + References No definition available. + Details
Name: | pega_UnbilledReceivablesNotBillableAtBalanceSheetDateAmountExpectedToBeCollectedWithinYearTwoAndFive
Namespace Prefix: | pega_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unbilled receivables not billable at balance sheet date expected percentage to be collected within one year. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition Unbilled receivables not billable at balance sheet date expected percentage to be collected within year one and two. + References No definition available. + Details
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Namespace Prefix: | pega_
Data Type: | num:percentItemType
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X
- Definition Unbilled receivables not billable at balance sheet date expected percentage to be collected within year two and five. + References No definition available. + Details
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Namespace Prefix: | pega_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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