Name:	ptvc_LimitedPartnershipAmountWithdrawnFromInvestment
Namespace Prefix:	ptvc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This element investment income (loss) net of fees of a limited partnership during the period.

No definition available.

Name:	ptvc_LimitedPartnershipInvestmentGainsLossNetOfFees
Namespace Prefix:	ptvc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This element represent the number of related party investments.

No definition available.

Name:	ptvc_NumberOfInvestments
Namespace Prefix:	ptvc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of the Company's directors that are executive officers, directors, and owners of organizations outside of the Company.

No definition available.

Name:	ptvc_NumberOfRelatedPartiesThatAreManagersOfOutsideEntity
Namespace Prefix:	ptvc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The equity interest of partners or other equity holders in a limited partnership.

No definition available.

Name:	ptvc_OwnershipInterestInLimitedPartnership
Namespace Prefix:	ptvc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

Name:	ptvc_RelatedPartyAbstract
Namespace Prefix:	ptvc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of transactions with related party during the financial reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

No definition available.

Name:	us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

Name:	srt_OwnershipAxis=ptvc_NewVernonIndiaFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_OwnershipAxis=ptvc_NewVernonGlobalOpportunityFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_OwnershipAxis=ptvc_NewVernonGlobalOpportunityFundIIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionAxis=ptvc_RelatedPartyTransactionsLimitedPartnershipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: