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Equity Transactions (Details) (USD $) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014
Equity Transactions [Abstract] |  |  |  |
Securities authorized amount |  |  |  | $ 100,000,000 mpaa_SecuritiesAuthorizedAmount
Shares issued as public offering (in shares) | 2,760,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Common stock issuance price (in dollars per share) | $ 26.00 us-gaap_SharePrice |  |  |
Option to purchase additional shares of common stock, maximum (in shares) | 360,000 mpaa_OptionToPurchaseAdditionalSharesOfCommonStockMaximum |  |  |
Aggregate gross proceeds from issuance of common stock | 71,760,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 71,760,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 0 us-gaap_ProceedsFromIssuanceOfCommonStock |
Aggregate net proceeds from issuance of common stock | $ 66,973,000 mpaa_NetProceedsFromIssuanceOfCommonStockAfterExpenses |  |  |

X
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- Definition Refers to option provided to underwriters to purchase maximum additional shares of common stock. + References No definition available. + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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