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Commitments, Contingencies and Guarantees (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Put Obtains Upon Termination and Other | $ 102,089 |  |
Investment Commitments | 4,106 |  |
Letters of Credit Outstanding, Amount | 4,771 | 5,830 |
Estimated Payments for Purchase of Ownership Interest on Exercise of Put Options | 15,866 |  |
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options | 1,414 |  |
Estimated Aggregate Amount For Purchase Of Ownership Interest On Exercise Of Put Options | 117,953 |  |
Operating Leases, Rent Expense | 36,457 | 26,847 | 18,429
Operating Leases, Income Statement, Sublease Revenue | 820 | 555 | 277
Accrued Sublease Income Receivable | $ 1,382 |  |

X
- Definition Sublease income earned but not yet received by the entity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated aggregate amount for purchase of ownership interest on exercise of put options. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Estimated issuance of share capital to purchase ownership interests on exercise of put options. + References No definition available. + Details
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Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Estimated payments to purchase ownership interests on exercise of put options. + References No definition available. + Details
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Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of fund to be committed towards investments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate amount that is obliged by the company to pay for ownership rights in subsidiary, only upon termination of such owner's employment with the applicable subsidiary or death. + References No definition available. + Details
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Namespace Prefix: | mdca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of revenue recognized for the period under subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6584307&loc=d3e41620-112719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Technical Bulletin (FTB) -Number 88-1 -Paragraph 9 -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. + Details
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