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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Additional Information (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Receivables [Abstract] |  |
Accounts receivable and unbilled receivable | $ 501,675 | $ 504,765
Accounts receivable and unbilled receivable percentage | 10.00% |

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- Definition Accounts receivable and unbilled receivable. + References No definition available. + Details
Name: | pega_AccountsReceivableAndUnbilledReceivable
Namespace Prefix: | pega_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accounts Receivable And Unbilled Receivable Percentage + References No definition available. + Details
Name: | pega_AccountsReceivableAndUnbilledReceivablePercentage
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