Subsequent Events (Details) (Subsequent Event [Member], Repurchase of Equity [Member], USD $)	1 Months Ended
Dec. 31, 2012
Subsequent Event [Member] \| Repurchase of Equity [Member]
Subsequent Event [Line Items]
Maximum amount of common stock to be sold by Shareholders	$ 300,000
Purchase price discount percentage (in hundredths)	10.00%
Number of consecutive trading days	5 days

Discount rate to reduce the purchase price for common stock to this specified percentage below the average daily closing price per share of the company's common stock for the five consecutive trading days immediately preceding the date of the notice of sale.

No definition available.

Name:	mpaa_PurchasePriceDiscountPercentage
Namespace Prefix:	mpaa_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration