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Related Party Transactions - Additional Information (Detail) - USD ($)			12 Months Ended
	Aug. 26, 2013	Aug. 05, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 01, 2014
Related Party Transactions [Abstract]
Initial term of lease agreement			7 years
Lease agreement expiration date			Mar. 31, 2021
Initial lease obligation			$ 480,000	$ 360,000		$ 480,000
Cash payments to third party	$ 3,000,000	$ 3,750,000		2,500,000
Cash payment from related party	$ 3,000,000	$ 3,750,000		2,500,000
Fee and other consulting service expenses			$ 43,000	$ 62,000	$ 127,000

X

- Definition

Initial Lease Term

+ References

No definition available.

+ Details

Name:	psix_InitialLeaseTerm
Namespace Prefix:	psix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Related party transaction expenses.

+ References

No definition available.

+ Details

Name:	psix_RelatedPartyTransactionExpenses
Namespace Prefix:	psix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration