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Accounts Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |
Unbilled accounts receivable | $ 166,315 | $ 135,180
Unapproved Change Orders, Claims, Request |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Unbilled accounts receivable | $ 56,800 | $ 47,100

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=psn_UnapprovedChangeOrdersClaimsRequestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |