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EARNINGS PER SHARE - Reconciliation of weighted average shares outstanding (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share
Net income available for stockholders	$ 2,929us-gaap_NetIncomeLoss	$ 1,978us-gaap_NetIncomeLoss
Less: Dividends paid	(1,532)us-gaap_DividendsCommonStock	(1,145)us-gaap_DividendsCommonStock
Undistributed earnings	$ 1,397us-gaap_UndistributedEarnings	$ 833us-gaap_UndistributedEarnings
Basic shares outstanding:
Common stock	35,784us-gaap_WeightedAverageNumberOfSharesIssuedBasic	35,746us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Restricted shares of common stock	1,244us-gaap_WeightedAverageNumberOfSharesRestrictedStock	1,212us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Basic shares outstanding, Total	37,028us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	36,958us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted shares outstanding:
Common stock	35,784mpx_WeightedAverageNumberOfSharesIssuedDiluted	35,746mpx_WeightedAverageNumberOfSharesIssuedDiluted
Dilutive effect of stock based awards	236us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	297us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted shares outstanding excluding restricted shares of common stock, Total	36,020mpx_WeightedAverageNumberOfDilutedSharesOutstandingIncludingCommonStockAndDilutiveEffectOfStockOption	36,043mpx_WeightedAverageNumberOfDilutedSharesOutstandingIncludingCommonStockAndDilutiveEffectOfStockOption
Restricted shares of common stock	1,244us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends	1,212us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends
Diluted shares outstanding, Total	37,264us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	37,255us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X

- Definition

The average number of diluted shares outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period including common stock and dilutive effect of stock option.

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Number of common stock issued during the year diluted.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Nonvested equity-based payment awards that contain forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) that result in incremental common shares.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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