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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       $ 100,000,000mpaa_SecuritiesAuthorizedAmount
Shares issued as public offering (in shares) 2,760,000us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Common stock issuance price (in dollars per share) $ 26.00us-gaap_SharePrice      
Option to purchase additional shares of common stock, maximum (in shares) 360,000mpaa_OptionToPurchaseAdditionalSharesOfCommonStockMaximum      
Aggregate gross proceeds from issuance of common stock 71,760,000us-gaap_ProceedsFromIssuanceOfCommonStock 71,760,000us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock  
Aggregate net proceeds from issuance of common stock $ 66,973,000mpaa_NetProceedsFromIssuanceOfCommonStockAfterExpenses