XML 142 R98.htm IDEA: XBRL DOCUMENT
v3.20.1

Investments in and Advances to Joint Ventures - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 29, 2017
Schedule Of Equity Method Investments [Line Items] |  |  |
Letters of credit outstanding amount | $ 197.3 | $ 223.0 |
Unconsolidated Joint Ventures |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Net distributions from unconsolidated joint ventures | 38.9 | 41.9 | $ 31.8
Consolidated Joint Ventures |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Letters of credit outstanding amount | $ 55.0 | $ 76.8 |

X
- Definition Distributions from (contributions to) equity method investment. + References No definition available. + Details
Name: | psn_DistributionsFromContributionsToEquityMethodInvestment
Namespace Prefix: | psn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=psn_UnconsolidatedJointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=psn_ConsolidatedJointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |