Name:	mpr_AverageCostPerSettledClaim
Namespace Prefix:	mpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

The number of claims dismissed during the period.

No definition available.

Name:	mpr_ClaimsDismissed
Namespace Prefix:	mpr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The number of claims settled during the period.

No definition available.

Name:	mpr_ClaimsSettled
Namespace Prefix:	mpr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period.

No definition available.

Name:	us-gaap_LitigationSettlementGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The total number of new claims filed pertaining to a loss contingency during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date.