| Document and Entity Information | Mar. 31, 2022 |
| Cover [Abstract] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001137091 |
| Document Type | 8-K/A |
| Document Period End Date | Mar. 31, 2022 |
| Entity Registrant Name | Power Solutions International, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-35944 |
| Entity Tax Identification Number | 33-0963637 |
| Entity Address, Address Line One | 201 Mittel Drive |
| Entity Address, City or Town | Wood Dale |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60191 |
| City Area Code | (630) |
| Local Phone Number | 350-9400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Description | Due to a clerical error, an incorrect version of the press release issued by Power Solutions International, Inc. (the “Company” or “PSI”) on March 31, 2022 announcing the Company’s financial results for the fourth quarter and full year 2021 was furnished as Exhibit 99.1 to the Current Report on Form 8-K filed with the Securities and Exchange Commission on such date (the “Original Filing”). A corrected copy of the press release is furnished as Exhibit 99.1 to this amended Current Report on Form 8-K and is incorporated herein by reference. The corrections relate solely to the section on the Company’s outlook. All other information in the Original Filing remains unchanged. |
