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Related Party Transaction - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 01, 2014 | Jun. 30, 2014
Related Party Transactions [Abstract] |  |
Initial term of lease agreement | 7 years |
Lease agreement expiration date | Mar. 31, 2021 |
Initial annual base rent | $ 480,000 |
Lease expense |  | $ 120,000

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- Definition Initial Annual Base Rent + References No definition available. + Details
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Namespace Prefix: | psix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Initial Lease Term + References No definition available. + Details
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Namespace Prefix: | psix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration