Stagwell (STGW) 10-Q 30 Apr 15 2015 Q1 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 26, 2015
Document Information [Line Items]
Entity Registrant Name	MDC PARTNERS INC
Entity Central Index Key	876883
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Trading Symbol	MDCA
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		50,597,903
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		3,755

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Services	$302,222	$274,854
Operating Expenses:
Cost of services sold	210,419	181,468
Office and general expenses	74,308	71,336
Depreciation and amortization	12,300	10,482
Costs and Expenses, Total	297,027	263,286
Operating profit	5,195	11,568
Other Income (Expense):
Other, net	-18,040	-6,571
Interest expense and finance charges	-15,096	-12,759
Interest income	119	140
Nonoperating Income (Expense), Total	-33,017	-19,190
Loss from continuing operations before income taxes and equity in non-consolidated affiliates	-27,822	-7,622
Income tax benefit	-4,054	-346
Loss from continuing operations before equity in non-consolidated affiliates	-23,768	-7,276
Equity in earnings of non-consolidated affiliates	351	63
Loss from continuing operations	-23,417	-7,213
Loss from continuing operations	-23,417	-7,213
Loss from discontinued operations attributable to MDC Partners Inc., net of taxes	-6,294	-271
Net loss	-29,711	-7,484
Net income attributable to the noncontrolling interests	-2,380	-1,362
Net loss attributable to MDC Partners Inc.	-32,091	-8,846
Basic and Diluted:
Loss from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share)	($0.52)	($0.17)
Discontinued operations attributable to MDC Partners Inc. common shareholders (usd per share)	($0.13)	($0.01)
Net loss attributable to MDC Partners Inc. common shareholders (usd per share)	($0.65)	($0.18)
Weighted Average Number of Common Shares Outstanding:
Basic (USD per share)	49,754,961	49,338,332
Diluted (USD per share)	49,754,961	49,338,332
Share-based Compensation [Abstract]
Cost of services sold	2,738	2,527
Office and general expenses	1,707	1,841
Total	$4,445	$4,368

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Comprehensive Loss
Net loss	($29,711)	($7,484)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	-5,181	-1,742
Other comprehensive income	-24,530	-5,742
Other Comprehensive Income (Loss), Net of Tax	5,181	1,742
Comprehensive income (loss) attributable to noncontrolling interest	151	-1,110
Comprehensive loss attributable to MDC Partners Inc.	($24,379)	($6,852)

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current Assets:
Cash and cash equivalents	$17,612	$119,767
Accounts receivable, less allowance for doubtful accounts of $1,436 and $1,409	453,362	355,295
Expenditures billable to clients	45,854	40,202
Other current assets	48,892	36,978
Total Current Assets	565,720	552,242
Fixed assets, at cost, less accumulated depreciation of $97,271 and $95,083	59,598	60,240
Investment in non-consolidated affiliates	8,888	6,110
Goodwill	838,857	851,373
Other intangibles assets, net	77,365	86,121
Deferred tax asset	23,570	18,758
Other assets	66,127	74,046
Total Assets	1,640,125	1,648,890
Current Liabilities:
Accounts payable	251,892	316,285
Accruals and other liabilities	324,021	271,273
Advance billings	173,104	142,608
Current portion of long-term debt	532	534
Current portion of deferred acquisition consideration	100,131	90,804
Total Current Liabilities	849,680	821,504
Long-term debt, less current portion	761,799	742,593
Long-term portion of deferred acquisition consideration	100,673	114,564
Other liabilities	45,814	45,861
Deferred tax liabilities	78,740	77,997
Total Liabilities	1,836,706	1,802,519
Redeemable Noncontrolling Interests (Note 2)	202,338	194,951
Commitments, contingencies and guarantees (Note 11)
Shareholders’ Deficit:
Charges in excess of capital	-229,622	-209,668
Accumulated deficit	-521,724	-489,633
Accumulated other comprehensive loss	-40	-7,752
MDC Partners Inc. Shareholders' Deficit	-482,564	-441,235
Noncontrolling Interests	83,645	92,655
Total Shareholders' Deficit	-398,919	-348,580
Total Liabilities, Redeemable Noncontrolling Interests and Shareholders’ Deficit	1,640,125	1,648,890
Common Class A
Shareholders’ Deficit:
Class A Shares, no par value, unlimited authorized, 49,846,285 and 49,680,109 shares issued and outstanding in 2015 and 2014	268,821	265,817
Class B Shares, no par value, unlimited authorized, 3,755 shares issued and outstanding in 2015 and 2014, each convertible into one Class A share	268,821	265,817
Common Class B
Shareholders’ Deficit:
Class A Shares, no par value, unlimited authorized, 49,846,285 and 49,680,109 shares issued and outstanding in 2015 and 2014	1	1
Class B Shares, no par value, unlimited authorized, 3,755 shares issued and outstanding in 2015 and 2014, each convertible into one Class A share	$1	$1

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Accounts receivable, allowance for doubtful accounts (in dollars)	$1,436	$1,409
Accumulated depreciation (in dollars)	$97,271	$95,083
Preferred stock, shares issued	0	0
Shares to be issued, shares	0	0
Common Class A
Common stock, shares issued	49,846,285	49,680,109
Common stock, shares outstanding	49,846,285	49,680,109
Common Class B
Common stock, shares issued	3,755	3,755
Common stock, shares outstanding	3,755	3,755

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	($29,711)	($7,484)
Loss from discontinued operations attributable to MDC Partners Inc., net of taxes	-6,294	-271
Loss from continuing operations	-23,417	-7,213
Non-cash stock-based compensation	4,445	4,368
Adjustments to reconcile net loss from continuing operations to cash used in operating activities:
Depreciation	4,537	3,943
Amortization of intangibles	7,763	6,581
Amortization of deferred finance charges and debt discount	1,494	577
Adjustment to deferred acquisition consideration	2,801	8,388
Deferred income benefit	-3,929	-579
Earnings of non-consolidated affiliates	-351	-63
Other non-current assets and liabilities	733	-12,188
Foreign exchange	15,219	5,145
Changes in working capital:
Accounts receivable	-97,760	-55,245
Expenditures billable to clients	-5,721	-6,177
Prepaid expenses and other current assets	-12,211	-9,458
Accounts payable, accruals and other liabilities	-42,651	-7,552
Advance billings	30,496	29,424
Cash flows used in continuing operating activities	-118,552	-40,049
Discontinued operations	-1,294	746
Net cash used in operating activities	-119,846	-39,303
Cash flows used in investing activities:
Capital expenditures	-5,656	-2,496
Acquisitions, net of cash acquired	-1,310	-39,951
Proceeds from sale of assets	29	0
Other investments	-2,318	-2,077
Profit distributions from non-consolidated affiliates	342	281
Cash flows used in continuing investing activities	-8,913	-44,243
Discontinued operations	-153	-500
Net cash used in investing activities	-9,066	-44,743
Cash flows from (used in) financing activities:
Proceeds of revolving credit agreement	19,602	32,292
Acquisition related payments	-11,142	-10,715
Repayment of long-term debt	-126	-72
Purchase of shares	-876	-3,103
Distributions to noncontrolling interests	-2,839	-2,276
Cash overdrafts	32,103	-6,853
Payment of dividends	-10,636	-9,724
Cash flows provided by (used in) continuing financing activities	26,086	-451
Discontinued operations	-40	-40
Net cash provided by (used in) financing activities	26,046	-491
Effect of exchange rate changes on cash and cash equivalents	711	27
Decrease in cash and cash equivalents	-102,155	-84,510
Cash and cash equivalents at beginning of period	119,767	102,007
Cash and cash equivalents at end of period	17,612	17,497
Supplemental disclosures:
Cash income taxes paid	540	83
Cash interest paid	367	334
Non-cash transactions:
Capital leases	42	0
Dividends payable	$1,384	$967

CONDENSED_STATEMENTS_OF_SHAREH

CONDENSED STATEMENTS OF SHAREHOLDERS' DEFICIT (USD $)	Total	Common Stock	Common Stock	Additional Paid-in Capital	Charges in Excess of Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Parent	Noncontrolling Interest
In Thousands, except Share data, unless otherwise specified		Common Class A	Common Class B
Balance at Dec. 31, 2014	($348,580)	$265,817	$1	$0	($209,668)	($489,633)	($7,752)	($441,235)	$92,655
Balance (in shares) at Dec. 31, 2014		49,680,108	3,754
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to MDC Partners	-32,091	0	0	0	0	-32,091	0	-32,091	0
Other Comprehensive income (loss)	5,181	0	0	0	0	0	7,712	7,712	-2,531
Issuance of restricted stock	0	3,880	0	-3,880	0	0	0	0	0
Issuance of restricted stock (in shares)		194,849	0
Shares acquired and cancelled	-876	-876	0	0	0	0	0	-876	0
Shares acquired and cancelled (in shares)		-28,673	0
Stock-based compensation	1,776	0	0	1,776	0	0	0	1,776	0
Changes in redemption value of redeemable noncontrolling interests	-4,290	0	0	-4,290	0	0	0	-4,290	0
Changes in noncontrolling interests and redeemable noncontrolling interest from step-up transactions	-9,396	0	0	-2,917	0	0	0	-2,917	-6,479
Dividends paid and to be paid	-10,643	0	0	-10,643	0	0	0	-10,643	0
Transfer to charges in excess of capital	0	0	0	19,954	-19,954	0	0	0	0
Balance at Mar. 31, 2015	($398,919)	$268,821	$1	$0	($229,622)	($521,724)	($40)	($482,564)	$83,645
Balance (in shares) at Mar. 31, 2015		49,846,285	3,755

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation
	MDC Partners Inc. (the “Company”) has prepared the unaudited condensed consolidated interim financial statements included herein pursuant to the rules and regulations of the United States Securities and Exchange Commission (the “SEC”). Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles (“GAAP”) of the United States of America (“US GAAP”) have been condensed or omitted pursuant to these rules.
	The accompanying financial statements reflect all adjustments, consisting of normally recurring accruals, which in the opinion of management are necessary for a fair presentation, in all material respects, of the information contained therein. Results of operations for interim periods are not necessarily indicative of annual results.
	These statements should be read in conjunction with the consolidated financial statements and related notes included in the Annual Report on Form 10-K for the year ended December 31, 2014.

Significant_Accounting_Policie

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies
	The Company’s significant accounting policies are summarized as follows:
	Principles of Consolidation. The accompanying condensed consolidated financial statements include the accounts of MDC Partners Inc. and its domestic and international controlled subsidiaries that are not considered variable interest entities, and variable interest entities for which the Company is the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.
	Use of Estimates. The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities including goodwill, intangible assets, valuation allowances for receivables and deferred tax assets and the reported amounts of revenue and expenses during the reporting period. The estimates are evaluated on an ongoing basis and are based on historical experience, current conditions and various other assumptions believed to be reasonable under the circumstances. Actual results could differ from these estimates.
	Fair Value. The Company applies the fair value measurement guidance of Codification Topic 820, Fair Value Measurements and Disclosure for financial assets and liabilities that are required to be measured at fair value and for nonfinancial assets and liabilities that are not required to be measured at fair value on a recurring basis, including goodwill and other identifiable intangible assets. The measurement of fair value requires the use of techniques based on observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. The inputs create the following fair value hierarchy:
	•	Level 1 — Quoted prices for identical instruments in active markets.
	•	Level 2 — Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations where inputs are observable or where significant value drivers are observable.
	•	Level 3 — Instruments where significant value drivers are unobservable to third parties.
	When available, quoted market prices are used to determine the fair value of our financial instruments and classify such items in Level 1. In some cases, quoted market prices are used for similar instruments in active markets and classify such items in Level 2.
	Concentration of Credit Risk. The Company provides marketing communications services to clients who operate in most industry sectors. Credit is granted to qualified clients in the ordinary course of business. Due to the diversified nature of the Company’s client base, the Company does not believe that it is exposed to a concentration of credit risk. No client accounted for more than 10% of the Company’s consolidated accounts receivable at March 31, 2015 and December 31, 2014. No clients accounted for 10% of the Company’s revenue for the three months ended March 31, 2015 and 2014.
	Cash and Cash Equivalents. The Company’s cash equivalents are primarily comprised of investments in overnight interest-bearing deposits, commercial paper and money market instruments and other short-term investments with original maturity dates of three months or less at the time of purchase. The Company has a concentration of credit risk in that there are cash deposits in excess of federally insured amounts. Included in cash and cash equivalents at March 31, 2015 and December 31, 2014, was $6,211 and $6,461, respectively, of cash restricted as to withdrawal pursuant to a collateral agreement and a customer's contractual requirement.
	Allowance for Doubtful Accounts.  Trade receivables are stated at invoiced amounts less allowances for doubtful accounts. The allowances represent estimated uncollectible receivables associated with potential customer defaults usually due to customers’ potential insolvency. The allowances include amounts for certain customers where a risk of default has been specifically identified. The assessment of the likelihood of customer defaults is based on various factors, including the length of time the receivables are past due, historical experience and existing economic conditions.
	Expenditures Billable to Clients.  Expenditures billable to clients consist principally of outside vendors costs incurred on behalf of clients when providing advertising, marketing and corporate communications services to clients that have not been invoiced. Such amounts are invoiced to clients at various times over the course of the production process.
	Fixed Assets.  Fixed assets are stated at cost, net of accumulated depreciation. Computers, furniture and fixtures are depreciated on a straight-line basis over periods of 3 to 7 years. Leasehold improvements are depreciated on a straight-line basis over the lesser of the term of the related lease or the estimated useful life of the asset. Repairs and maintenance costs are expensed as incurred.
	Equity Method Investments. The equity method is used to account for investments in entities in which the Company has an ownership interest of less than 50% and has significant influence, or joint control by contractual arrangement with all parties having an equity interest, over the operating and financial policies of the affiliate or has an ownership interest greater than 50% however the substantive participating rights of the noncontrolling interest shareholders preclude the Company of exercising unilateral control over the operating and financial policies of the affiliate. The Company’s investments accounted for using the equity method includes a 30% undivided interest in a real estate joint venture and various interests in investment funds. The Company’s management periodically evaluates these investments to determine if there has been a decline in value that is other than temporary. These investments are included in investments in non-consolidated affiliates.
	Cost Method Investments. From time to time, the Company makes non-material cost based investments in start-up advertising technology companies and innovative consumer product companies where the Company does not exercise significant influence over the operating and financial policies of the investee. The total net cost basis of these investments, which is included in Other Assets on the balance sheet, as of March 31, 2015 and December 31, 2014 was $10,420 and $10,196, respectively. These investments are periodically evaluated to determine if there have been any other than temporary declines below book value. A variety of factors are considered when determining if a decline in fair value below book value is other than temporary, including, among others, the financial condition and prospects of the investee, as well as the Company’s investment intent.  In addition, the Company's partner agencies may receive minority equity interests from start-up companies in lieu of fees.
	Business Combinations. Valuations of acquired companies are based on a number of factors, including specialized know-how, reputation, competitive position and service offerings. The Company’s acquisition strategy has been focused on acquiring the expertise of an assembled workforce in order to continue to build upon the core capabilities of its various strategic business platforms to better serve the Company’s clients. Consistent with the acquisition strategy and past practice of acquiring a majority ownership position, most acquisitions completed after 2010 included an initial payment at the time of closing and provide for future additional contingent purchase price payments. Contingent payments for these transactions, as well as certain acquisitions completed in prior years, are derived using the performance of the acquired entity and are based on predetermined formulas. Contingent purchase price obligations for acquisitions completed prior to January 1, 2009 are accrued when the contingency is resolved and payment is certain. Contingent purchase price obligations related to acquisitions completed subsequent to December 31, 2008 are recorded as liabilities at estimated value and are remeasured at each reporting period and changes in estimated value are recorded in results of operations. For the three months ended March 31, 2015 and 2014, $2,248 and $8,022, respectively, related to changes in estimated value was recorded as operating expenses. In addition, certain acquisitions also include put/call obligations for additional equity ownership interests. The estimated value of these interests is recorded as Redeemable Noncontrolling Interests. As of January 1, 2009, the Company expenses acquisition related costs in accordance with the Accounting Standard’s Codification’s guidance on acquisition accounting. For the three months ended March 31, 2015 and 2014, $874 and $1,071, respectively, of acquisition related costs were charged to operations.
	For each of the Company's acquisitions, we undertake a detailed review to identify other intangible assets and a valuation is performed for all such identified assets. We use several market participant measurements to determine estimated value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies. Like most service businesses, a substantial portion of the intangible asset value that the Company acquires is the specialized know-how of the workforce, which is treated as part of goodwill and is not required to be valued separately. The majority of the value of the identifiable intangible assets acquired is derived from customer relationships, including the related customer contracts, as well as trade names. In executing the Company's acquisition strategy, one of the primary drivers in identifying and executing a specific transaction is the existence of, or the ability to, expand the existing client relationships. The expected benefits of the Company's acquisitions are typically shared across multiple agencies and regions.
	Redeemable Noncontrolling Interest. The minority interest shareholders of certain subsidiaries have the right to require the Company to acquire their ownership interest under certain circumstances pursuant to a contractual arrangement and the Company has similar call options under the same contractual terms. The amount of consideration under the put and call rights is not a fixed amount, but rather is dependent upon various valuation formulas and on future events, such as the average earnings of the relevant subsidiary through the date of exercise, the growth rate of the earnings of the relevant subsidiary through the date of exercise, etc. as described in Note 11.
	The Company has recorded the value of put options held by noncontrolling interests as mezzanine equity at their current estimated redemption amounts. The Company accrues changes in the redemption amounts over the period from the date of issuance to the earliest redemption date of the put options. The Company accounts for the put options with a charge to income attributable to noncontrolling interests to reflect the excess, if any, of the estimated exercise price over the estimated fair value of the noncontrolling interest shares at the date of the option being exercised. For the three months ended March 31, 2015 and 2014, there were no charges to income attributable to noncontrolling interests. Changes in the estimated redemption amounts of the put options are adjusted at each reporting period with a corresponding adjustment to equity. These adjustments will not impact the calculation of earnings (loss) per share.
	The following table presents changes in Redeemable Noncontrolling Interests:
		Three Months Ended March 31, 2015			Year Ended December 31, 2014
	Beginning Balance	$	194,951		$	148,534
	Redemptions	(1,729		)	(4,820		)
	Granted (1)	5,704			13,327
	Changes in redemption value	4,290			38,850
	Currency Translation Adjustments	(878		)	(940		)
	Ending Balance	$	202,338		$	194,951
	(1) Grants in 2015 consist entirely of transfers from Noncontrolling Interests related to step-up transactions.
	Variable Interest Entity. Effective March 28, 2012, the Company invested in Doner Partners LLC (“Doner”), and has determined that this entity is a variable interest entity (“VIE”) and is consolidated for all periods subsequent to the date of investment. The Company acquired a 30% voting interest and convertible preferred interests that allow the Company to increase ordinary voting ownership to 70% at the Company’s option. Doner is a full service integrated creative agency that is included as part of our portfolio in the Strategic Marketing Services Segment. The Company’s Credit Agreement (see Note 7) is guaranteed and secured by all of Doner’s assets.
	The Company has determined that it is the primary beneficiary because the Company receives a disproportionate share of profits and losses as compared to the Company’s ownership percentage. Total assets and total liabilities of Doner included in the Company’s consolidated balance sheet at March 31, 2015 were $154,855 and $125,670, respectively and at December 31, 2014 were $223,305 and $192,340, respectively.
	Guarantees.  Guarantees issued or modified by the Company to third parties after January 1, 2003 are generally recognized, at the inception or modification of a guarantee, as a liability for the obligations it has undertaken in issuing the guarantee, including its ongoing obligation to stand ready to perform over the term of the guarantee in the event that the specified triggering events or conditions occur. The initial measurement of that liability is the fair value of the guarantee. The recognition of the liability is required even if it is not probable that payments will be required under the guarantee. The Company’s liability associated with guarantees is not significant. (See Note 11.)
	Revenue Recognition. The Company’s revenue recognition policies are as required by the Revenue Recognition topics of the FASB Accounting Standards Codification, and accordingly, revenue is generally recognized as services are provided or upon delivery of the products when ownership and risk of loss has transferred to the customer, the selling price is fixed or determinable and collection of the resulting receivable is reasonably assured. The Company follows the Revenue Arrangements with Multiple Deliverables topic of the FASB Accounting Standards Codification issued. This topic addresses certain aspects of the accounting by a vendor for arrangements under which it will perform multiple revenue-generating activities and how to determine whether an arrangement involving multiple deliverables contains more than one unit of accounting. The Company also follows the Reporting Revenue Gross as a Principal versus Net as an Agent topic that summarizes the EITF’s views on when revenue should be recorded at the gross amount billed because it has earned revenue from the sale of goods or services, or the net amount retained because it has earned a fee or commission. The Company also follows the Income Statement Characterization of Reimbursements Received for Out-of-Pocket Expenses Incurred topic, for reimbursements received for out-of-pocket expenses, which summarizes the EITF’s views that reimbursements received for out-of-pocket expenses incurred should be characterized in the income statement as revenue. Accordingly, the Company has included such reimbursed expenses in revenue.
	The Company earns revenue from agency arrangements in the form of retainer fees or commissions; from short-term project arrangements in the form of fixed fees or per diem fees for services; and from incentives or bonuses.
	Non-refundable retainer fees are generally recognized on a straight-line basis over the term of the specific customer arrangement. Commission revenue is earned and recognized upon the placement of advertisements in various media when the Company has no further performance obligations. Fixed fees for services are recognized upon completion of the earnings process and acceptance by the client. Per diem fees are recognized upon the performance of the Company’s services. In addition, for a limited number of certain service transactions, which require delivery of a number of service acts, the Company uses the Proportional Performance model, which generally results in revenue being recognized based on the straight-line method.
	Fees billed to clients in excess of fees recognized as revenue are classified as Advanced Billings.
	A small portion of the Company’s contractual arrangements with customers includes performance incentive provisions, which allows the Company to earn additional revenues as a result of its performance relative to both quantitative and qualitative goals. The Company recognizes the incentive portion of revenue under these arrangements when specific quantitative goals are assured, or when the Company’s clients determine performance against qualitative goals has been achieved. In all circumstances, revenue is only recognized when collection is reasonably assured. The Company records revenue net of sales and other taxes due to be collected and remitted to governmental authorities.
	Cost of Services Sold.  Costs of services sold do not include depreciation charges for fixed assets.
	Interest Expense. Interest expense primarily consists of the cost of borrowing on the 6.75% Notes and the Credit Agreement. The Company uses the effective interest method to amortize the deferred financing costs and original issue premium on the 6.75% Notes. The Company also uses the straight-line method to amortize the deferred financing costs on the Credit Agreement.
	Income Taxes. The Company’s US operating units are generally structured as limited liability companies, which are treated as partnerships for tax purposes.   The Company is only taxed on its share of profits, while noncontrolling holders are responsible for taxes on their share of the profits. The Company currently has a fully reserved valuation allowance for its US net operating losses.   During the three months ended March 31, 2015 and 2014, the effective tax rate was generally lower than the statutory rate due to additional valuation allowances recorded primarily in the US.
	Stock-Based Compensation.  Under the fair value method, compensation cost is measured at fair value at the date of grant and is expensed over the service period, that is the award’s vesting period. When awards are exercised, share capital is credited by the sum of the consideration paid together with the related portion previously credited to additional paid-in capital when compensation costs were charged against income or acquisition consideration.
	The Company uses its historical volatility derived over the expected term of the award, to determine the volatility factor used in determining the fair value of the award.
	Stock-based awards that are settled in cash or may be settled in cash at the option of employees are recorded as liabilities. The measurement of the liability and compensation cost for these awards is based on the fair value of the award, and is recorded into operating income (expense) over the service period, that is the vesting period of the award. Changes in the Company’s payment obligation prior to the settlement date are recorded as compensation cost in operating income in the period of the change. The final payment amount for such awards is established on the date of the exercise of the award by the employee.
	Stock-based awards that are settled in cash or equity at the option of the Company are recorded at fair value on the date of grant and recorded as additional paid-in capital. The fair value measurement of the compensation cost for these awards is based on using the Black-Scholes option pricing-model and is recorded in operating income over the service period, that is the vesting period of the award.
	It is the Company’s policy for issuing shares upon the exercise of an equity incentive award to verify the amount of shares to be issued, as well as the amount of proceeds to be collected (if any) and delivery of new shares to the exercising party.
	The Company has adopted the straight-line attribution method for determining the compensation cost to be recorded during each accounting period. However, awards based on performance conditions are recorded as compensation expense when the performance conditions are expected to be met.
	The Company treats benefits paid by shareholders or equity members to employees as a stock based compensation charge with a corresponding credit to additional paid-in-capital.
	From time to time, certain acquisitions and step up acquisitions include an element of compensation related payments. The Company accounts for those payments as stock-based compensation.
	During the three months ended March 31, 2015, the Company issued no restricted stock units (“RSUs”) to its employees and directors.
	A total of 751,618 Class A shares of restricted stock, granted to employees as equity incentive awards but not yet vested, have been excluded in the Company’s calculation of Class A shares outstanding as of March 31, 2015.
	Loss per Common Share.  Basic loss per share is based upon the weighted average number of common shares outstanding during each period, including the “Share capital to be issued” as reflected in the Shareholders’ Equity on the balance sheet. Diluted loss per share is based on the above, plus, if dilutive, common share equivalents, which include outstanding options, warrants, stock appreciation rights, restricted stock units and convertible notes.
	Foreign Currency Translation.  The Company’s financial statements were prepared in accordance with the requirements of the Foreign Currency Translation topic of the FASB Accounting Standards Codification. The functional currency of the Company is the Canadian dollar and it has decided to use U.S. Dollars as its reporting currency for consolidated reporting purposes. All of the Company’s subsidiaries use their local currency as their functional currency. Accordingly, the currency impacts of the translation of the balance sheets of the Company’s non-U.S. Dollar based subsidiaries to U.S. Dollar statements are included as cumulative translation adjustments in accumulated other comprehensive income. Translation of intercompany debt, which is not intended to be repaid, is included in cumulative translation adjustments. Cumulative translation adjustments are not included in net earnings unless they are actually realized through a sale or upon complete or substantially complete liquidation of the Company’s net investment in the foreign operation. Translation of current intercompany balances are included in net earnings. The balance sheets of non-U.S. Dollar based subsidiaries are translated at the period end rate. The income statements of non-U.S. Dollar based subsidiaries are translated at average exchange rates for the period.
	Gains and losses arising from the Company’s foreign currency transactions are reflected in net earnings. Unrealized gains or losses arising on the translation of certain intercompany foreign currency transactions that are of a long-term nature (that is settlement is not planned or anticipated in the future) are included as cumulative translation adjustments in accumulated other comprehensive income.

Loss_Per_Common_Share

Loss Per Common Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Loss Per Common Share	Loss Per Common Share
	The following table sets forth the computation of basic and diluted loss per common share from continuing operations.
		Three Months Ended
		March 31,
		2015			2014
	Numerator
	Numerator for basic loss per common share - loss from continuing operations	$	(23,417	)	$	(7,213	)
	Net income attributable to the non-controlling interests	(2,380		)	(1,362		)
	Net loss attributable to MDC Partners Inc. common shareholders from continuing operations	(25,797		)	(8,575		)
	Effect of dilutive securities	—			—
	Numerator for diluted loss per common share - loss attributable to MDC Partners Inc. common shareholders from continuing operations	$	(25,797	)	$	(8,575	)
	Denominator
	Denominator for basic loss per common share - weighted average common shares	49,754,961			49,338,332
	Effect of dilutive securities	—			—
	Denominator for diluted loss per common share - adjusted weighted shares and assumed conversions	49,754,961			49,338,332
	Basic loss per common share from continuing operations	$	(0.52	)	$	(0.17	)
	Diluted loss per common share from continuing operations	$	(0.52	)	$	(0.17	)
	During the three months ended March 31, 2015, options and other rights to purchase 944,835 shares of common stock, which includes 832,335 shares of non-vested restricted stock and restricted stock units, were outstanding and were not included in the computation of diluted income per common share because their effect would be antidilutive.
	During the three months ended March 31, 2014, options and other rights to purchase 1,113,210 shares of common stock, which includes 1,000,710 shares of non-vested restricted stock, were outstanding and were not included in the computation of diluted income per common share because their effect would be antidilutive.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	Acquisitions
	Pro forma financial information has not been presented for 2015 since there were no material acquisitions. During 2015, the Company completed a number of step-up transactions to increase its equity ownership percentage in majority owned entities.
	2015 Acquisitions
	During the first quarter of 2015, the Company entered into various non-material transactions with certain majority owned entities.
	2014 Acquisitions
	During 2014, the Company entered into several acquisitions and various non-material transactions with certain majority owned entities. Effective January 1, 2014, MDC acquired 60% of the equity interests of Luntz Global Partners LLC (“LG”). Effective February 14, 2014, MDC acquired 65% of the equity interests of Kingsdale Partners LP (“Kingsdale”). LG and Kingsdale are both in the Company’s Performance Marketing Services segment. On June 3, 2014, MDC acquired a 100% equity interest in The House Worldwide Ltd ("THW"). On July 31, 2014, Union Advertising Canada LP acquired 100% of the issued and outstanding stock of Trapeze Media Limited ("Trapeze"). Effective August 1, 2014 MDC acquired 65% of the equity interests of Hunter PR LLC ("Hunter PR"). Effective August 18, 2014, MDC acquired a 75% interest in Albion Brand Communication Limited ("Albion"). In addition, in June 2014 and August 2014, MDC (through a subsidiary) entered into other non-material acquisitions. THW, Trapeze, Hunter PR, and Albion are all included within the Company's Strategic Marketing Services segment.
	The aggregate purchase price of these acquisitions has an estimated present value at acquisition date of $151,202 and consisted of total closing cash payments of $67,236, and additional deferred acquisition payments that will be based on the financial results of the underlying businesses from 2014 to 2018 with final payments due in 2019. These additional deferred payments have an estimated present value at acquisition date of $83,966. An allocation of excess purchase price consideration of these acquisitions to the fair value of the net assets acquired resulted in identifiable intangibles of $61,906, consisting primarily of customer lists, a technology asset and covenants not to compete, and goodwill of $149,234, representing the value of the assembled workforce. The identified assets will be amortized over a five to six year period in a manner represented by the pattern in which the economic benefits of the customer contracts/relationships are realized. In addition, the Company has recorded $50,552 as the present value of noncontrolling interest and $13,327 as the present value of redeemable noncontrolling interest. Intangibles and goodwill of $149,232 are tax deductible. In addition, the Company recorded other income of $908 representing a gain on the previously held 18% interest in Trapeze.
	The actual adjustments that the Company will ultimately make in finalizing the allocation of purchase price to fair value of the net assets acquired will depend on a number of factors.
	Noncontrolling Interests
	Changes in the Company’s ownership interests in our less than 100% owned subsidiaries during the three months ended March 31, were as follows:
	Net Income (Loss) Attributable to MDC Partners Inc. and
	Transfers (to) from the Noncontrolling Interest
		Three Months Ended March 31,
		2015			2014
	Net loss attributable to MDC Partners Inc.	$	(32,091	)	$	(8,846	)
	Transfers from the noncontrolling Interest:
	Decrease in MDC Partners Inc. paid in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests	(2,917		)	(4,798		)
	Net transfers from noncontrolling interest	$	(2,917	)	$	(4,798	)
	Change from net loss attributable to MDC Partners Inc. and transfers to non controlling interest	$	(35,008	)	$	(13,644	)

Accruals_and_Other_Liabilities

Accruals and Other Liabilities	3 Months Ended
	Mar. 31, 2015
Accrued and Other Liabilities [Abstract]
Accruals and Other Liabilities	Accruals and Other Liabilities
	At March 31, 2015 and December 31, 2014, accruals and other liabilities included accrued media of $214,435 and $144,161, respectively; trust liabilities of $6,173 and $6,419, respectively; and included amounts due to noncontrolling interest holders, for their share of profits, which will be distributed within the next twelve months of $5,439 and $6,014, respectively.
	Changes in noncontrolling interest amounts included in accrued and other liabilities for the year ended December 31, 2014 and three months ended March 31, 2015 were as follows:
		Noncontrolling
		Interests
	Balance, December 31, 2013	$	5,210
	Income attributable to noncontrolling interests	6,890
	Distributions made	(6,523		)
	Other (1)	437
	Balance, December 31, 2014	$	6,014
	Income attributable to noncontrolling interests	2,380
	Distributions made	(2,839		)
	Other (1)	(116		)
	Balance, March 31, 2015	$	5,439
	(1) Other primarily relates to step-up transactions, discontinued operations, and cumulative translation adjustments.

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations
	In the fourth quarter of 2014, the Company classified Accent Marketing Services, LLC, which was previously reported in the Performance Marketing Services segment, as discontinued operations.
	Included in discontinued operations in the Company’s consolidated statements of operations for the three months ended March 31, 2015 and 2014 was the following:
		Three Months Ended
		March 31,
		2015			2014
	Revenue	$	15,524		$	17,715
	Operating loss	$	(1,552	)	$	(161	)
	Other expense	$	(72	)	$	(110	)
	Loss on disposal	(4,670		)	—
	Net loss from discontinued operations attributable to MDC Partners Inc., net of taxes	$	(6,294	)	$	(271	)
	At March 31, 2015, other current assets and other long term assets included assets held for sale of $5,622 and $11,378, respectively. At December 31, 2014, other current assets and other long term assets included assets held for sale of $5,591 and $16,409, respectively.

Debt

Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	Debt
	The Company's indebtedness was comprised of:
		March 31,		31-Dec-14
		2015
	Revolving credit agreement	$	19,602	$	—
	6.75% Senior Notes due 2020	735,000		735,000
	Original issue premium	6,722		7,017
		761,324		742,017
	Obligations under capital leases	1,007		1,110
		762,331		743,127
	Less current portion:	532		534
		$	761,799	$	742,593
	MDC Financing Agreement and Senior Notes
	Issuance of 6.75% Senior Notes
	On March 20, 2013, MDC Partners Inc. (“MDC”) entered into an indenture (the “Indenture”) among MDC, its existing and future restricted subsidiaries that guarantee, or are co-borrowers under or grant liens to secure, MDC’s senior secured revolving credit agreement (the “Credit Agreement”), as guarantors (the “Guarantors”) and The Bank of New York Mellon, as trustee, relating to the issuance by MDC of its $550,000 aggregate principal amount 6.75% Senior Notes due 2020 (the “6.75% Notes”). The 6.75% Notes bear interest at a rate of 6.75% per annum, accruing from March 20, 2013. Interest is payable semiannually in arrears in cash on April 1 and October 1 of each year, beginning on October 1, 2013. The 6.75% Notes will mature on April 1, 2020, unless earlier redeemed or repurchased. The Company received net proceeds from the offering of the 6.75% Notes equal to approximately $537,600. The Company used the net proceeds to redeem all of the existing 11% Notes, together with accrued interest, related premiums, fees and expenses and recorded a charge for loss on redemption of notes of $55,588, including write offs of unamortized original issue premium and debt issuance costs. Remaining proceeds were used for general corporate purposes.
	On November 15, 2013, the Company issued an additional $110,000 aggregate principal amount of its 6.75% Notes. The additional notes were issued under the Indenture governing the 6.75% Notes and treated as a single series with the original 6.75% Notes. The additional notes were sold in a private placement in reliance on exceptions from registration under the Securities Act of 1933, as amended. The Company received net proceeds before expenses of $111,925, which included an original issue premium of $4,125, and underwriter fees of $2,200. The Company used the net proceeds of the offering for general corporate purposes.
	On April 2, 2014, the Company issued an additional $75,000 aggregate principal amount of 6.75% Notes. The additional notes were issued under the Indenture governing the 6.75% Notes and treated as a single series with the original 6.75% Notes. The additional notes were sold in private placement in reliance on exceptions from registration under the Securities Act of 1933, as amended. The Company received net proceeds before expenses of $77,452, which included an original issue premium of $3,938, and underwriter fees of $1,500. The Company used the net proceeds of the offering for general corporate purposes, including the funding of deferred acquisition consideration, working capital, acquisitions and the repayment of the amount outstanding under our senior secured revolving credit facility.
	The 6.75% Notes are guaranteed on a senior unsecured basis by all of MDC’s existing and future restricted subsidiaries that guarantee, or are co-borrowers under or grant liens to secure the Credit Agreement. The 6.75% Notes are unsecured and unsubordinated obligations of MDC and rank (i) equally in right of payment with all of MDC’s or any Guarantor’s existing and future senior indebtedness, (ii) senior in right of payment to MDC’s or any Guarantor’s existing and future subordinated indebtedness, (iii) effectively subordinated to all of MDC’s or any Guarantor’s existing and future secured indebtedness to the extent of the collateral securing such indebtedness, including the Credit Agreement, and (iv) structurally subordinated to all existing and future liabilities of MDC’s subsidiaries that are not Guarantors.
	MDC may, at its option, redeem the 6.75% Notes in whole at any time or in part from time to time, on and after April 1, 2016 at a redemption price of 103.375% of the principal amount thereof if redeemed during the twelve-month period beginning on April 1, 2016, at a redemption price of 101.688% of the principal amount thereof if redeemed during the twelve-month period beginning on April 1, 2017 and at a redemption price of 100% of the principal amount thereof if redeemed on April 1, 2018 and thereafter.
	Prior to April 1, 2016, MDC may, at its option, redeem some or all of the 6.75% Notes at a price equal to 100% of the principal amount of the 6.75% Notes plus a “make whole” premium and accrued and unpaid interest. MDC may also redeem, at its option, prior to April 1, 2016, up to 35% of the 6.75% Notes with the proceeds from one or more equity offerings at a redemption price of 106.750% of the principal amount thereof.
	If MDC experiences certain kinds of changes of control (as defined in the Indenture), holders of the 6.75% Notes may require MDC to repurchase any 6.75% Notes held by them at a price equal to 101% of the principal amount of the 6.75% Notes plus accrued and unpaid interest. In addition, if MDC sells assets under certain circumstances, it must offer to repurchase the 6.75% Notes at a price equal to 100% of the principal amount of the 6.75% Notes plus accrued and unpaid interest.
	The Indenture includes covenants that, among other things, restrict MDC’s ability and the ability of its restricted subsidiaries (as defined in the Indenture) to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; create restrictions on the payment of dividends or other amounts from MDC’s restricted subsidiaries; sell assets; enter into transactions with affiliates; create liens; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The 6.75% Notes are also subject to customary events of default, including cross-payment default and cross-acceleration provision.
	Credit Agreement
	On March 20, 2013, MDC, Maxxcom Inc. (a subsidiary of MDC) and each of their subsidiaries party thereto entered into an amended and restated, $225 million senior secured revolving credit agreement due 2018 (the “Credit Agreement”) with Wells Fargo Capital Finance, LLC, as agent, and the lenders from time to time party thereto. Advances under the Credit Agreement will be used for working capital and general corporate purposes, in each case pursuant to the terms of the Credit Agreement. Capitalized terms used in this section and not otherwise defined have the meanings set forth in the Credit Agreement.
	Effective October 23, 2014, MDC and its subsidiaries entered into an amendment of its Credit Agreement. The amendment: (i) expands the commitments under the facility by $100 million, from $225 million to $325 million; (ii) extends the date by an additional eighteen months to September 30, 2019; (iii) reduces the base borrowing interest rate by 25 basis points (the applicable margin for borrowing is 1.00% in the case of Base Rate Loans and 1.75% in the case of LIBOR Rate Loans) ; and (iv) modifies certain covenants to provide the Company with increased flexibility to fund its continued growth and other general corporate purposes.
	Advances under the Credit Agreement bear interest as follows: (a)(i) LIBOR Rate Loans bore interest at the LIBOR Rate and (ii) Base Rate Loans bear interest at the Base Rate, plus (b) an applicable margin. The initial applicable margin for borrowing is 1.00% in the case of Base Rate Loans and 1.75% in the case of LIBOR Rate Loans. In addition to paying interest on outstanding principal under the Credit Agreement, MDC is required to pay an unused revolver fee to lenders under the Credit Agreement in respect of unused commitments thereunder.
	The Credit Agreement is guaranteed by substantially all of MDC’s present and future subsidiaries, other than immaterial subsidiaries and subject to customary exceptions. The Credit Agreement includes covenants that, among other things, restrict MDC’s ability and the ability of its subsidiaries to incur or guarantee additional indebtedness; pay dividends on or redeem or repurchase the capital stock of MDC; make certain types of investments; impose limitations on dividends or other amounts from MDC’s subsidiaries; incur certain liens, sell or otherwise dispose of certain assets; enter into transactions with affiliates; enter into sale and leaseback transactions; and consolidate or merge with or into, or sell substantially all of MDC’s assets to, another person. These covenants are subject to a number of important limitations and exceptions. The Credit Agreement also contains financial covenants, including a total leverage ratio, a senior leverage ratio, a fixed charge coverage ratio and a minimum earnings level. The Credit Agreement is also subject to customary events of default.
	The Company is currently in compliance with all of the terms and conditions of its Credit Agreement, and management believes, based on its current financial projections, that the Company will be in compliance with the covenants over the next twelve months. At March 31, 2015, there were $19,602 borrowings under the Credit Agreement.
	At March 31, 2015, the Company had issued $4,803 of undrawn outstanding Letters of Credit.
	At March 31, 2015 and December 31, 2014, accounts payable included $40,044 and $72,147 of outstanding checks, respectively.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	Effective January 1, 2008, the Company adopted guidance regarding accounting for Fair Value Measurements, for financial assets and liabilities. This guidance defines fair value, establishes a framework for measuring fair value and expands the related disclosure requirements. The statement indicates, among other things, that a fair value measurement assumes a transaction to sell an asset or transfer a liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability.
	In order to increase consistency and comparability in fair value measurements, the guidance establishes a hierarchy for observable and unobservable inputs used to measure fair value into three broad levels, which are described below:
	•	Level 1:  Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs.
	•	Level 2:  Observable prices that are based on inputs not quoted on active markets, but corroborated by market data.
	•	Level 3:  Unobservable inputs are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs.
	In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as considers counterparty credit risk in its assessment of fair value.
	On a nonrecurring basis, the Company uses fair value measures when analyzing asset impairment. Long-lived assets and certain identifiable intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If it is determined such indicators are present and the review indicates that the assets will not be fully recoverable, based on undiscounted estimated cash flows over the remaining amortization periods, their carrying values are reduced to estimated fair value. Measurements based on undiscounted cash flows are considered to be level 3 inputs. During the fourth quarter of each year, the Company evaluates goodwill and indefinite-lived intangibles for impairment at the reporting unit level. For each acquisition, the Company performed a detailed review to identify intangible assets and a valuation is performed for all such identified assets. The Company used several market participant measurements to determine estimated value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies. The amounts allocated to assets acquired and liabilities assumed in the acquisitions were determined using level 3 inputs. Fair value for property and equipment was based on other observable transactions for similar property and equipment. Accounts receivable represents the best estimate of balances that will ultimately be collected, which is based in part on allowance for doubtful accounts reserve criteria and an evaluation of the specific receivable balances.
	The following tables present certain information for our financial liabilities that is disclosed at fair value on a recurring basis at March 31, 2015 and December 31, 2014:
		Level 1						Level 1
		31-Mar-15						31-Dec-14
		Carrying			Fair Value			Carrying		Fair Value
		Amount						Amount
	Liabilities:
	6.75% Notes due 2020	$	741,722		$	773,588		$	742,017	$	751,538
	Our long term debt includes fixed rate debt. The fair value of this instrument is based on quoted market prices.
	The following table presents changes in Deferred Acquisition Consideration:
		Fair Value
		Measurements Using
		Significant
		Unobservable Inputs
		(Level 3)
		March 31,			December 31,
		2015			2014
	Beginning Balance of contingent payments	$	172,227		$	151,848
	Payments	(2,033		)	(61,441		)
	Grants (1)	2,944			68,642
	Redemption value adjustments (2)	3,723			20,816
	Transfers to (from) fixed payments	—			(5,146		)
	Foreign translation adjustment	(3,055		)	(2,492		)
	Ending Balance of contingent payments	$	173,806		$	172,227
	(1) Grants are the initial estimated deferred acquisition payments of new acquisitions completed within that fiscal
	period.
	(2) Redemption value adjustments are fair value changes from the Company’s initial estimates of deferred acquisition
	payments, including the accretion of present value and stock based compensation charges relating to acquisition
	payments that are tied to continued employment.
	In addition to the above amounts, there are fixed payments of $26,998 and $33,141 for total deferred acquisition consideration of $200,804 and $205,368, which reconciles to the consolidated financial statements at March 31, 2015 and December 31, 2014, respectively.
	The Company includes the payments of all deferred acquisition consideration in financing activities in the Company's consolidated statement of cash flows, as the Company believes these payments to be seller related financing activities, which is the predominant source of cash flows.
	Level 3 payments relate to payments made for deferred acquisition consideration. Level 3 grants relate to contingent purchase price obligations related to acquisitions. The Company records the initial liability of the estimated present value. The estimated liability is determined in accordance with various contractual valuation formulas that may be dependent on future events, such as the growth rate of the earnings of the relevant subsidiary during the contractual period, and, in some cases, the currency exchange rate of the date of payment. Level 3 redemption value adjustments relate to the remeasurement and change in these various contractual valuation formulas as well as adjustments of present value.
	At March 31, 2015 and December 31, 2014, the carrying amount of the Company’s financial instruments, including cash and cash equivalents, accounts receivable and accounts payable, approximated fair value because of their short-term maturity.

Other_Income_Expense

Other Income (Expense)	3 Months Ended
	Mar. 31, 2015
Other Income and Expenses [Abstract]
Other Income (Expense)	Other Income (Expense)
		Three Months Ended March 31,
		2015			2014
	Other income (expense)	$	490		$	(19	)
	Foreign currency loss	(18,530		)	(6,552		)
		$	(18,040	)	$	(6,571	)

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information
	The Company’s segment reporting is consistent with the current manner of how the Chief Operating Decision Maker (“CODM”) and the Board of Directors view the business. The Company is focused on expanding its capabilities in database marketing and data analytics in order to position the Company for future business development efforts and revenue growth.
	In order to position this strategic focus along the lines of how the CODM and management will base their business decisions, the Company reports in one reportable segment and two "other" segments. Decisions regarding allocation of resources are made and will be made based not only on the individual operating results of the subsidiaries but also on the overall performance of the reportable segments. These reportable segments are the aggregation of various reporting segments.
	The Company reports in one reportable Strategic Marketing Services segment plus two “other” segments, Performance Marketing Services and corporate. The segments are as follows:
	•	The Strategic Marketing Services segment consists of integrated marketing consulting services firms that offer a full complement of marketing, activation and consulting services including advertising and media, marketing communications including direct marketing, public relations, corporate communications, market research, corporate identity and branding, interactive marketing, and sales promotion. Each of the entities within the Strategic Marketing Services Group share similar economic characteristics, specifically related to the nature of their respective services, the manner in which the services are provided and the similarity of their respective customers. Due to the similarities in these businesses, they exhibit similar long term financial performance and have been aggregated together.
	•	The Performance Marketing Services segment includes our firms that provide consumer insights and analytics to satisfy the growing need for targetable, measurable solutions or cost effective means of driving return on marketing investment. These services interface directly with the consumer of a client’s product or service. Such services include the design, development, research and implementation of consumer services, media planning and buying, and direct marketing initiatives. In addition, services include consumer activation, investor relations and general public insights.
	The significant accounting policies of these segments are the same as those described in the summary of significant accounting policies included in the notes to the consolidated financial statements. The Company continues to evaluate its Corporate Group and the services provided by the Corporate Group to the operating segments.
	Summary financial information concerning the Company’s operating segments is shown in the following tables:
	Three Months Ended March 31, 2015
	(thousands of United States dollars)
		Strategic			Performance			Corporate			Total
		Marketing			Marketing
		Services			Services
	Revenue	$	240,436		$	61,786		$	—		$	302,222
	Cost of services sold	166,026			44,393			—			210,419
	Office and general expenses	49,156			11,154			13,998			74,308
	Depreciation and amortization	6,423			5,430			447			12,300
	Operating profit (loss)	18,831			809			(14,445		)	5,195
	Other Income (Expense):
	Other expense, net										(18,040		)
	Interest expense, net										(14,977		)
	Loss from continuing operations before income taxes and equity in non-consolidated affiliates										(27,822		)
	Income tax benefit										(4,054		)
	Loss from continuing operations before equity in non-consolidated affiliates										(23,768		)
	Equity in earnings of non-consolidated affiliates										351
	Loss from continuing operations										(23,417		)
	Loss from discontinued operations attributable to MDC Partners Inc., net of taxes										(6,294		)
	Net Loss										(29,711		)
	Net income attributable to the non-controlling interests	(2,293		)	(87		)	—			(2,380		)
	Net loss attributable to MDC Partners Inc.										$	(32,091	)
	Stock based compensation	$	2,524		$	1,121		$	800		$	4,445
	Supplemental Segment Information:
	Capital expenditures	$	5,330		$	258		$	68		$	5,656
	Goodwill and intangibles	$	553,066		$	363,156		$	—		$	916,222
	Total Assets	$	918,200		$	565,411		$	156,514		$	1,640,125
	Three Months Ended March 31, 2014
	(thousands of United States dollars)
		Strategic			Performance			Corporate			Total
		Marketing			Marketing
		Services			Services
	Revenue	$	214,804		$	60,050		$	—		$	274,854
	Cost of services sold	140,560			40,908			—			181,468
	Office and general expenses	45,046			16,315			9,975			71,336
	Depreciation and amortization	5,148			4,832			502			10,482
	Operating profit (loss)	24,050			(2,005		)	(10,477		)	11,568
	Other Income (Expense):
	Other expense,net										(6,571		)
	Interest expense, net										(12,619		)
	Loss from continuing operations before income taxes, equity in affiliates										(7,622		)
	Income tax benefit										(346		)
	Loss from continuing operations before equity in affiliates										(7,276		)
	Equity in earnings of non-consolidated affiliates										63
	Loss from continuing operations										(7,213		)
	Loss from discontinuing operations attributable to MDC Partners Inc., net of taxes										(271		)
	Net loss										(7,484		)
	Net income attributable to the noncontrolling interests	(1,390		)	28			—			(1,362		)
	Net loss attributable to MDC Partners Inc.										$	(8,846	)
	Stock based compensation	$	2,139		$	1,277		$	952		$	4,368
	Supplemental Segment Information:
	Capital expenditures	$	1,702		$	253		$	541		$	2,496
	Goodwill and intangibles	$	522,170		$	424,485		$	—		$	946,655
	Total Assets	$	860,571		$	573,308		$	136,393		$	1,570,272
	A summary of the Company’s revenue by geographic area, based on the location in which the services originated, is set forth in the following table:
		United			Canada			Other			Total
States
Revenue
Three Months Ended March 31,
2015	$	252,018		$	29,825		$	20,379		$	302,222
2014	$	228,833		$	30,913		$	15,108		$	274,854

Commitments_Contingencies_and_

Commitments, Contingencies and Guarantees	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Guarantees	Commitments, Contingencies and Guarantees
	Deferred Acquisition Consideration. In addition to the consideration paid by the Company in respect of certain of its acquisitions at closing, additional consideration may be payable, or may be potentially payable based on the achievement of certain threshold levels of earnings. See Note 2 and Note 4.
	Put Options. Owners of interests in certain subsidiaries have the right in certain circumstances to require the Company to acquire the remaining ownership interests held by them. The owners’ ability to exercise any such “put option” right is subject to the satisfaction of certain conditions, including conditions requiring notice in advance of exercise. In addition, these rights cannot be exercised prior to specified staggered exercise dates. The exercise of these rights at their earliest contractual date would result in obligations of the Company to fund the related amounts during the remainder of 2015 to 2023. It is not determinable, at this time, if or when the owners of these rights will exercise all or a portion of these rights.
	The amount payable by the Company in the event such rights are exercised is dependent on various valuation formulas and on future events, such as the average earnings of the relevant subsidiary through the date of exercise, the growth rate of the earnings of the relevant subsidiary during that period, and, in some cases, the currency exchange rate at the date of payment.
	Management estimates, assuming that the subsidiaries owned by the Company at March 31, 2015, perform over the relevant future periods at their trailing twelve-months earnings levels, that these rights, if all exercised, could require the Company, in future periods, to pay an aggregate amount of approximately $21,632 to the owners of such rights to acquire such ownership interests in the relevant subsidiaries. Of this amount, the Company is entitled, at its option, to fund approximately $87 by the issuance of share capital. In addition, the Company is obligated under similar put option rights to pay an aggregate amount of approximately $180,706 only upon termination of such owner’s employment with the applicable subsidiary or death. Included in redeemable noncontrolling interests at March 31, 2015 is $202,338 of these put options because they are not within the control of the Company. The ultimate amount payable relating to these transactions will vary because it is dependent on the future results of operations of the subject businesses and the timing of when these rights are exercised.
	Natural Disasters. Certain of the Company’s operations are located in regions of the United States and Caribbean which typically are subject to hurricanes. During the three months ended March 31, 2015 and 2014, these operations did not incur any costs related to damages resulting from hurricanes.
	Guarantees.  Generally, the Company has indemnified the purchasers of certain assets in the event that a third party asserts a claim against the purchaser that relates to a liability retained by the Company. These types of indemnification guarantees typically extend for a number of years. Historically, the Company has not made any significant indemnification payments under such agreements and no amount has been accrued in the accompanying consolidated financial statements with respect to these indemnification guarantees. The Company continues to monitor the conditions that are subject to guarantees and indemnifications to identify whether it is probable that a loss has occurred, and would recognize any such losses under any guarantees or indemnifications in the period when those losses are probable and estimable
	Legal Proceedings.  The Company’s operating entities are involved in legal proceedings of various types. While any litigation contains an element of uncertainty, the Company has no reason to believe that the outcome of such proceedings or claims will have a material adverse effect on the financial condition or results of operations of the Company.
	Commitments.   At March 31, 2015, the Company had issued $4,803 of undrawn outstanding letters of credit. In addition, the Company has commitments to fund investments in an aggregate amount of $8,588.

New_Accounting_Pronouncements

New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements
	In April 2015, the FASB issued Standards Update 2015-03, Intangibles - Goodwill and Other-Internal-Use Software. This update amends Topic 350 and provides explicit guidance about customer’s accounting for fees paid in a cloud computing arrangement and whether it includes a software license. This guidance is effective for the Company beginning January 1, 2016. The implementation of the amended accounting guidance is not expected to have a material impact on our consolidated financial position or results of operations.
	In April 2015, the FASB issued Standards Update 2015-03, Interest - Imputation of Interest. This update amends Topic 835 and requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability. This guidance is effective for the Company beginning January 1, 2016. The Company is currently assessing the impact on the presentation of our financial position and disclosures.
	In May 2014, the FASB issued Standards Update 2014-09, Revenue with Contracts from Customers. This update supersedes Topic 605, Revenue Recognition. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, an entity must apply a five-step approach. ASU 2014-09 provides for one of two methods of transition: retrospective application to each prior period presented; or, recognition of the cumulative effect of retrospective application of the new standard in the period of initial application. This guidance is effective for the Company beginning January 1, 2017. The Company is currently assessing the impact and choice of transition method.

Subsequent_Events_Notes

Subsequent Events (Notes)	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Since October 5, 2014, the Company has been actively cooperating with the production of documents for review by the Securities and Exchange Commission pursuant to a Subpoena.  In connection with this production of documents, the Company formed a Special Committee of independent directors to review certain matters relating to the reimbursement of expenses incurred by the CEO.  The Special Committee completed an extensive review of perquisites and payments made by the Company on behalf of the CEO during the period 2009 through 2014.  Following the review, the CEO agreed to reimburse the Company for the perquisites and expenses in the aggregate amount of $8,600, which will be recorded as income in the second quarter of 2015.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Earnings Per Share, Policy [Policy Text Block]	Loss per Common Share.  Basic loss per share is based upon the weighted average number of common shares outstanding during each period, including the “Share capital to be issued” as reflected in the Shareholders’ Equity on the balance sheet. Diluted loss per share is based on the above, plus, if dilutive, common share equivalents, which include outstanding options, warrants, stock appreciation rights, restricted stock units and convertible notes.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation.  The Company’s financial statements were prepared in accordance with the requirements of the Foreign Currency Translation topic of the FASB Accounting Standards Codification. The functional currency of the Company is the Canadian dollar and it has decided to use U.S. Dollars as its reporting currency for consolidated reporting purposes. All of the Company’s subsidiaries use their local currency as their functional currency. Accordingly, the currency impacts of the translation of the balance sheets of the Company’s non-U.S. Dollar based subsidiaries to U.S. Dollar statements are included as cumulative translation adjustments in accumulated other comprehensive income. Translation of intercompany debt, which is not intended to be repaid, is included in cumulative translation adjustments. Cumulative translation adjustments are not included in net earnings unless they are actually realized through a sale or upon complete or substantially complete liquidation of the Company’s net investment in the foreign operation. Translation of current intercompany balances are included in net earnings. The balance sheets of non-U.S. Dollar based subsidiaries are translated at the period end rate. The income statements of non-U.S. Dollar based subsidiaries are translated at average exchange rates for the period.
Guarantees, Indemnifications and Warranties Policies [Policy Text Block]	Guarantees.  Guarantees issued or modified by the Company to third parties after January 1, 2003 are generally recognized, at the inception or modification of a guarantee, as a liability for the obligations it has undertaken in issuing the guarantee, including its ongoing obligation to stand ready to perform over the term of the guarantee in the event that the specified triggering events or conditions occur. The initial measurement of that liability is the fair value of the guarantee. The recognition of the liability is required even if it is not probable that payments will be required under the guarantee. The Company’s liability associated with guarantees is not significant. (See Note 11.)
Premiums Receivable, Allowance for Doubtful Accounts, Estimation Methodology, Policy [Policy Text Block]	Allowance for Doubtful Accounts.  Trade receivables are stated at invoiced amounts less allowances for doubtful accounts. The allowances represent estimated uncollectible receivables associated with potential customer defaults usually due to customers’ potential insolvency. The allowances include amounts for certain customers where a risk of default has been specifically identified. The assessment of the likelihood of customer defaults is based on various factors, including the length of time the receivables are past due, historical experience and existing economic conditions.
Expenditures Billable To Clients, Policy [Policy Text Block]	Expenditures Billable to Clients.  Expenditures billable to clients consist principally of outside vendors costs incurred on behalf of clients when providing advertising, marketing and corporate communications services to clients that have not been invoiced. Such amounts are invoiced to clients at various times over the course of the production process.
Property, Plant and Equipment, Policy [Policy Text Block]	Fixed Assets.  Fixed assets are stated at cost, net of accumulated depreciation. Computers, furniture and fixtures are depreciated on a straight-line basis over periods of 3 to 7 years. Leasehold improvements are depreciated on a straight-line basis over the lesser of the term of the related lease or the estimated useful life of the asset. Repairs and maintenance costs are expensed as incurred.
Equity Method Investments, Policy [Policy Text Block]	Equity Method Investments. The equity method is used to account for investments in entities in which the Company has an ownership interest of less than 50% and has significant influence, or joint control by contractual arrangement with all parties having an equity interest, over the operating and financial policies of the affiliate or has an ownership interest greater than 50% however the substantive participating rights of the noncontrolling interest shareholders preclude the Company of exercising unilateral control over the operating and financial policies of the affiliate. The Company’s investments accounted for using the equity method includes a 30% undivided interest in a real estate joint venture and various interests in investment funds. The Company’s management periodically evaluates these investments to determine if there has been a decline in value that is other than temporary. These investments are included in investments in non-consolidated affiliates.
Principles of Consolidation	Principles of Consolidation. The accompanying condensed consolidated financial statements include the accounts of MDC Partners Inc. and its domestic and international controlled subsidiaries that are not considered variable interest entities, and variable interest entities for which the Company is the primary beneficiary. Intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates, Policy	Use of Estimates. The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities including goodwill, intangible assets, valuation allowances for receivables and deferred tax assets and the reported amounts of revenue and expenses during the reporting period. The estimates are evaluated on an ongoing basis and are based on historical experience, current conditions and various other assumptions believed to be reasonable under the circumstances. Actual results could differ from these estimates.
Fair Value	Fair Value. The Company applies the fair value measurement guidance of Codification Topic 820, Fair Value Measurements and Disclosure for financial assets and liabilities that are required to be measured at fair value and for nonfinancial assets and liabilities that are not required to be measured at fair value on a recurring basis, including goodwill and other identifiable intangible assets. The measurement of fair value requires the use of techniques based on observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. The inputs create the following fair value hierarchy:
	•	Level 1 — Quoted prices for identical instruments in active markets.
	•	Level 2 — Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations where inputs are observable or where significant value drivers are observable.
	•	Level 3 — Instruments where significant value drivers are unobservable to third parties.
	When available, quoted market prices are used to determine the fair value of our financial instruments and classify such items in Level 1. In some cases, quoted market prices are used for similar instruments in active markets and classify such items in Level 2.
Concentration of Credit Risk	Concentration of Credit Risk. The Company provides marketing communications services to clients who operate in most industry sectors. Credit is granted to qualified clients in the ordinary course of business. Due to the diversified nature of the Company’s client base, the Company does not believe that it is exposed to a concentration of credit risk. No client accounted for more than 10% of the Company’s consolidated accounts receivable at March 31, 2015 and December 31, 2014. No clients accounted for 10% of the Company’s revenue for the three months ended March 31, 2015 and 2014.
Cash and Cash Equivalents	Cash and Cash Equivalents. The Company’s cash equivalents are primarily comprised of investments in overnight interest-bearing deposits, commercial paper and money market instruments and other short-term investments with original maturity dates of three months or less at the time of purchase. The Company has a concentration of credit risk in that there are cash deposits in excess of federally insured amounts. Included in cash and cash equivalents at March 31, 2015 and December 31, 2014, was $6,211 and $6,461, respectively, of cash restricted as to withdrawal pursuant to a collateral agreement and a customer's contractual requirement.
Cost Method Investments, Policy	Cost Method Investments. From time to time, the Company makes non-material cost based investments in start-up advertising technology companies and innovative consumer product companies where the Company does not exercise significant influence over the operating and financial policies of the investee. The total net cost basis of these investments, which is included in Other Assets on the balance sheet, as of March 31, 2015 and December 31, 2014 was $10,420 and $10,196, respectively. These investments are periodically evaluated to determine if there have been any other than temporary declines below book value. A variety of factors are considered when determining if a decline in fair value below book value is other than temporary, including, among others, the financial condition and prospects of the investee, as well as the Company’s investment intent.  In addition, the Company's partner agencies may receive minority equity interests from start-up companies in lieu of fees.
Business Combinations	Business Combinations. Valuations of acquired companies are based on a number of factors, including specialized know-how, reputation, competitive position and service offerings. The Company’s acquisition strategy has been focused on acquiring the expertise of an assembled workforce in order to continue to build upon the core capabilities of its various strategic business platforms to better serve the Company’s clients. Consistent with the acquisition strategy and past practice of acquiring a majority ownership position, most acquisitions completed after 2010 included an initial payment at the time of closing and provide for future additional contingent purchase price payments. Contingent payments for these transactions, as well as certain acquisitions completed in prior years, are derived using the performance of the acquired entity and are based on predetermined formulas. Contingent purchase price obligations for acquisitions completed prior to January 1, 2009 are accrued when the contingency is resolved and payment is certain. Contingent purchase price obligations related to acquisitions completed subsequent to December 31, 2008 are recorded as liabilities at estimated value and are remeasured at each reporting period and changes in estimated value are recorded in results of operations. For the three months ended March 31, 2015 and 2014, $2,248 and $8,022, respectively, related to changes in estimated value was recorded as operating expenses. In addition, certain acquisitions also include put/call obligations for additional equity ownership interests. The estimated value of these interests is recorded as Redeemable Noncontrolling Interests. As of January 1, 2009, the Company expenses acquisition related costs in accordance with the Accounting Standard’s Codification’s guidance on acquisition accounting. For the three months ended March 31, 2015 and 2014, $874 and $1,071, respectively, of acquisition related costs were charged to operations.
	For each of the Company's acquisitions, we undertake a detailed review to identify other intangible assets and a valuation is performed for all such identified assets. We use several market participant measurements to determine estimated value. This approach includes consideration of similar and recent transactions, as well as utilizing discounted expected cash flow methodologies. Like most service businesses, a substantial portion of the intangible asset value that the Company acquires is the specialized know-how of the workforce, which is treated as part of goodwill and is not required to be valued separately. The majority of the value of the identifiable intangible assets acquired is derived from customer relationships, including the related customer contracts, as well as trade names. In executing the Company's acquisition strategy, one of the primary drivers in identifying and executing a specific transaction is the existence of, or the ability to, expand the existing client relationships. The expected benefits of the Company's acquisitions are typically shared across multiple agencies and regions.
Redeemable Noncontrolling Interest	Redeemable Noncontrolling Interest. The minority interest shareholders of certain subsidiaries have the right to require the Company to acquire their ownership interest under certain circumstances pursuant to a contractual arrangement and the Company has similar call options under the same contractual terms. The amount of consideration under the put and call rights is not a fixed amount, but rather is dependent upon various valuation formulas and on future events, such as the average earnings of the relevant subsidiary through the date of exercise, the growth rate of the earnings of the relevant subsidiary through the date of exercise, etc. as described in Note 11.
	The Company has recorded the value of put options held by noncontrolling interests as mezzanine equity at their current estimated redemption amounts. The Company accrues changes in the redemption amounts over the period from the date of issuance to the earliest redemption date of the put options. The Company accounts for the put options with a charge to income attributable to noncontrolling interests to reflect the excess, if any, of the estimated exercise price over the estimated fair value of the noncontrolling interest shares at the date of the option being exercised. For the three months ended March 31, 2015 and 2014, there were no charges to income attributable to noncontrolling interests. Changes in the estimated redemption amounts of the put options are adjusted at each reporting period with a corresponding adjustment to equity. These adjustments will not impact the calculation of earnings (loss) per share.
Variable Interest Entity	Variable Interest Entity. Effective March 28, 2012, the Company invested in Doner Partners LLC (“Doner”), and has determined that this entity is a variable interest entity (“VIE”) and is consolidated for all periods subsequent to the date of investment. The Company acquired a 30% voting interest and convertible preferred interests that allow the Company to increase ordinary voting ownership to 70% at the Company’s option. Doner is a full service integrated creative agency that is included as part of our portfolio in the Strategic Marketing Services Segment. The Company’s Credit Agreement (see Note 7) is guaranteed and secured by all of Doner’s assets.
	The Company has determined that it is the primary beneficiary because the Company receives a disproportionate share of profits and losses as compared to the Company’s ownership percentage. Total assets and total liabilities of Doner included in the Company’s consolidated balance sheet at March 31, 2015 were $154,855 and $125,670, respectively and at December 31, 2014 were $223,305 and $192,340, respectively.
Revenue Recognition	Revenue Recognition. The Company’s revenue recognition policies are as required by the Revenue Recognition topics of the FASB Accounting Standards Codification, and accordingly, revenue is generally recognized as services are provided or upon delivery of the products when ownership and risk of loss has transferred to the customer, the selling price is fixed or determinable and collection of the resulting receivable is reasonably assured. The Company follows the Revenue Arrangements with Multiple Deliverables topic of the FASB Accounting Standards Codification issued. This topic addresses certain aspects of the accounting by a vendor for arrangements under which it will perform multiple revenue-generating activities and how to determine whether an arrangement involving multiple deliverables contains more than one unit of accounting. The Company also follows the Reporting Revenue Gross as a Principal versus Net as an Agent topic that summarizes the EITF’s views on when revenue should be recorded at the gross amount billed because it has earned revenue from the sale of goods or services, or the net amount retained because it has earned a fee or commission. The Company also follows the Income Statement Characterization of Reimbursements Received for Out-of-Pocket Expenses Incurred topic, for reimbursements received for out-of-pocket expenses, which summarizes the EITF’s views that reimbursements received for out-of-pocket expenses incurred should be characterized in the income statement as revenue. Accordingly, the Company has included such reimbursed expenses in revenue.
	The Company earns revenue from agency arrangements in the form of retainer fees or commissions; from short-term project arrangements in the form of fixed fees or per diem fees for services; and from incentives or bonuses.
	Non-refundable retainer fees are generally recognized on a straight-line basis over the term of the specific customer arrangement. Commission revenue is earned and recognized upon the placement of advertisements in various media when the Company has no further performance obligations. Fixed fees for services are recognized upon completion of the earnings process and acceptance by the client. Per diem fees are recognized upon the performance of the Company’s services. In addition, for a limited number of certain service transactions, which require delivery of a number of service acts, the Company uses the Proportional Performance model, which generally results in revenue being recognized based on the straight-line method.
	Fees billed to clients in excess of fees recognized as revenue are classified as Advanced Billings.
	A small portion of the Company’s contractual arrangements with customers includes performance incentive provisions, which allows the Company to earn additional revenues as a result of its performance relative to both quantitative and qualitative goals. The Company recognizes the incentive portion of revenue under these arrangements when specific quantitative goals are assured, or when the Company’s clients determine performance against qualitative goals has been achieved. In all circumstances, revenue is only recognized when collection is reasonably assured. The Company records revenue net of sales and other taxes due to be collected and remitted to governmental authorities.
Cost of Services Sold [Policy Text Block]	Cost of Services Sold.  Costs of services sold do not include depreciation charges for fixed assets.
Interest Expense	Interest Expense. Interest expense primarily consists of the cost of borrowing on the 6.75% Notes and the Credit Agreement. The Company uses the effective interest method to amortize the deferred financing costs and original issue premium on the 6.75% Notes. The Company also uses the straight-line method to amortize the deferred financing costs on the Credit Agreement.
Income Tax	Income Taxes. The Company’s US operating units are generally structured as limited liability companies, which are treated as partnerships for tax purposes.   The Company is only taxed on its share of profits, while noncontrolling holders are responsible for taxes on their share of the profits. The Company currently has a fully reserved valuation allowance for its US net operating losses.   During the three months ended March 31, 2015 and 2014, the effective tax rate was generally lower than the statutory rate due to
Share-based Compensation	Stock-Based Compensation.  Under the fair value method, compensation cost is measured at fair value at the date of grant and is expensed over the service period, that is the award’s vesting period. When awards are exercised, share capital is credited by the sum of the consideration paid together with the related portion previously credited to additional paid-in capital when compensation costs were charged against income or acquisition consideration.
	The Company uses its historical volatility derived over the expected term of the award, to determine the volatility factor used in determining the fair value of the award.
	Stock-based awards that are settled in cash or may be settled in cash at the option of employees are recorded as liabilities. The measurement of the liability and compensation cost for these awards is based on the fair value of the award, and is recorded into operating income (expense) over the service period, that is the vesting period of the award. Changes in the Company’s payment obligation prior to the settlement date are recorded as compensation cost in operating income in the period of the change. The final payment amount for such awards is established on the date of the exercise of the award by the employee.
	Stock-based awards that are settled in cash or equity at the option of the Company are recorded at fair value on the date of grant and recorded as additional paid-in capital. The fair value measurement of the compensation cost for these awards is based on using the Black-Scholes option pricing-model and is recorded in operating income over the service period, that is the vesting period of the award.
	It is the Company’s policy for issuing shares upon the exercise of an equity incentive award to verify the amount of shares to be issued, as well as the amount of proceeds to be collected (if any) and delivery of new shares to the exercising party.
	The Company has adopted the straight-line attribution method for determining the compensation cost to be recorded during each accounting period. However, awards based on performance conditions are recorded as compensation expense when the performance conditions are expected to be met.
	The Company treats benefits paid by shareholders or equity members to employees as a stock based compensation charge with a corresponding credit to additional paid-in-capital.
	From time to time, certain acquisitions and step up acquisitions include an element of compensation related payments. The Company accounts for those payments as stock-based compensation.
	During the three months ended March 31, 2015, the Company issued no restricted stock units (“RSUs”) to its employees and directors.
	A total of 751,618 Class A shares of restricted stock, granted to employees as equity incentive awards but not yet vested, have been excluded in the Company’s calculation of Class A shares outstanding as of March 31, 2015.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Redeemable Noncontrolling Interest	The following table presents changes in Redeemable Noncontrolling Interests:
		Three Months Ended March 31, 2015			Year Ended December 31, 2014
	Beginning Balance	$	194,951		$	148,534
	Redemptions	(1,729		)	(4,820		)
	Granted (1)	5,704			13,327
	Changes in redemption value	4,290			38,850
	Currency Translation Adjustments	(878		)	(940		)
	Ending Balance	$	202,338		$	194,951
	(1) Grants in 2015 consist entirely of transfers from Noncontrolling Interests related to step-up transactions.

Loss_Per_Common_Share_Tables

Loss Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	The following table sets forth the computation of basic and diluted loss per common share from continuing operations.
		Three Months Ended
		March 31,
		2015			2014
	Numerator
	Numerator for basic loss per common share - loss from continuing operations	$	(23,417	)	$	(7,213	)
	Net income attributable to the non-controlling interests	(2,380		)	(1,362		)
	Net loss attributable to MDC Partners Inc. common shareholders from continuing operations	(25,797		)	(8,575		)
	Effect of dilutive securities	—			—
	Numerator for diluted loss per common share - loss attributable to MDC Partners Inc. common shareholders from continuing operations	$	(25,797	)	$	(8,575	)
	Denominator
	Denominator for basic loss per common share - weighted average common shares	49,754,961			49,338,332
	Effect of dilutive securities	—			—
	Denominator for diluted loss per common share - adjusted weighted shares and assumed conversions	49,754,961			49,338,332
	Basic loss per common share from continuing operations	$	(0.52	)	$	(0.17	)
	Diluted loss per common share from continuing operations	$	(0.52	)	$	(0.17	)

Acquisitions_Tables

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Schedule of Net Income (Loss) Attributable to Parent and Transfers to and from Noncontrolling Interest	Changes in the Company’s ownership interests in our less than 100% owned subsidiaries during the three months ended March 31, were as follows:
	Net Income (Loss) Attributable to MDC Partners Inc. and
	Transfers (to) from the Noncontrolling Interest
		Three Months Ended March 31,
		2015			2014
	Net loss attributable to MDC Partners Inc.	$	(32,091	)	$	(8,846	)
	Transfers from the noncontrolling Interest:
	Decrease in MDC Partners Inc. paid in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests	(2,917		)	(4,798		)
	Net transfers from noncontrolling interest	$	(2,917	)	$	(4,798	)
	Change from net loss attributable to MDC Partners Inc. and transfers to non controlling interest	$	(35,008	)	$	(13,644	)

Accruals_and_Other_Liabilities1

Accruals and Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Accrued and Other Liabilities [Abstract]
Accrued and Other Liabilities Disclosure	Accruals and Other Liabilities
	At March 31, 2015 and December 31, 2014, accruals and other liabilities included accrued media of $214,435 and $144,161, respectively; trust liabilities of $6,173 and $6,419, respectively; and included amounts due to noncontrolling interest holders, for their share of profits, which will be distributed within the next twelve months of $5,439 and $6,014, respectively.
	Changes in noncontrolling interest amounts included in accrued and other liabilities for the year ended December 31, 2014 and three months ended March 31, 2015 were as follows:
		Noncontrolling
		Interests
	Balance, December 31, 2013	$	5,210
	Income attributable to noncontrolling interests	6,890
	Distributions made	(6,523		)
	Other (1)	437
	Balance, December 31, 2014	$	6,014
	Income attributable to noncontrolling interests	2,380
	Distributions made	(2,839		)
	Other (1)	(116		)
	Balance, March 31, 2015	$	5,439
	(1) Other primarily relates to step-up transactions, discontinued operations, and cumulative translation adjustments.

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	Included in discontinued operations in the Company’s consolidated statements of operations for the three months ended March 31, 2015 and 2014 was the following:
		Three Months Ended
		March 31,
		2015			2014
	Revenue	$	15,524		$	17,715
	Operating loss	$	(1,552	)	$	(161	)
	Other expense	$	(72	)	$	(110	)
	Loss on disposal	(4,670		)	—
	Net loss from discontinued operations attributable to MDC Partners Inc., net of taxes	$	(6,294	)	$	(271	)

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Debt	:
		March 31,		31-Dec-14
		2015
	Revolving credit agreement	$	19,602	$	—
	6.75% Senior Notes due 2020	735,000		735,000
	Original issue premium	6,722		7,017
		761,324		742,017
	Obligations under capital leases	1,007		1,110
		762,331		743,127
	Less current portion:	532		534
		$	761,799	$	742,593

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value, Inputs, Level 1
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis	The following tables present certain information for our financial liabilities that is disclosed at fair value on a recurring basis at March 31, 2015 and December 31, 2014:
		Level 1						Level 1
		31-Mar-15						31-Dec-14
		Carrying			Fair Value			Carrying		Fair Value
		Amount						Amount
	Liabilities:
	6.75% Notes due 2020	$	741,722		$	773,588		$	742,017	$	751,538
Fair Value, Inputs, Level 3
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis	The following table presents changes in Deferred Acquisition Consideration:
		Fair Value
		Measurements Using
		Significant
		Unobservable Inputs
		(Level 3)
		March 31,			December 31,
		2015			2014
	Beginning Balance of contingent payments	$	172,227		$	151,848
	Payments	(2,033		)	(61,441		)
	Grants (1)	2,944			68,642
	Redemption value adjustments (2)	3,723			20,816
	Transfers to (from) fixed payments	—			(5,146		)
	Foreign translation adjustment	(3,055		)	(2,492		)
	Ending Balance of contingent payments	$	173,806		$	172,227
	(1) Grants are the initial estimated deferred acquisition payments of new acquisitions completed within that fiscal
	period.
	(2) Redemption value adjustments are fair value changes from the Company’s initial estimates of deferred acquisition
	payments, including the accretion of present value and stock based compensation charges relating to acquisition
	payments that are tied to continued employment.

Other_Income_Expense_Tables

Other Income (Expense) (Tables)	3 Months Ended
	Mar. 31, 2015
Other Income and Expenses [Abstract]
Schedule of Other Nonoperating Income (Expense)	Other Income (Expense)
		Three Months Ended March 31,
		2015			2014
	Other income (expense)	$	490		$	(19	)
	Foreign currency loss	(18,530		)	(6,552		)
		$	(18,040	)	$	(6,571	)

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015													Mar. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment
		Strategic			Performance			Corporate			Total				Strategic			Performance			Corporate			Total
		Marketing			Marketing										Marketing			Marketing
		Services			Services										Services			Services
	Revenue	$	240,436		$	61,786		$	—		$	302,222		Revenue	$	214,804		$	60,050		$	—		$	274,854
	Cost of services sold	166,026			44,393			—			210,419			Cost of services sold	140,560			40,908			—			181,468
	Office and general expenses	49,156			11,154			13,998			74,308			Office and general expenses	45,046			16,315			9,975			71,336
	Depreciation and amortization	6,423			5,430			447			12,300			Depreciation and amortization	5,148			4,832			502			10,482
	Operating profit (loss)	18,831			809			(14,445		)	5,195			Operating profit (loss)	24,050			(2,005		)	(10,477		)	11,568
	Other Income (Expense):													Other Income (Expense):
	Other expense, net										(18,040		)	Other expense,net										(6,571		)
	Interest expense, net										(14,977		)	Interest expense, net										(12,619		)
	Loss from continuing operations before income taxes and equity in non-consolidated affiliates										(27,822		)	Loss from continuing operations before income taxes, equity in affiliates										(7,622		)
	Income tax benefit										(4,054		)	Income tax benefit										(346		)
	Loss from continuing operations before equity in non-consolidated affiliates										(23,768		)	Loss from continuing operations before equity in affiliates										(7,276		)
	Equity in earnings of non-consolidated affiliates										351			Equity in earnings of non-consolidated affiliates										63
	Loss from continuing operations										(23,417		)	Loss from continuing operations										(7,213		)
	Loss from discontinued operations attributable to MDC Partners Inc., net of taxes										(6,294		)	Loss from discontinuing operations attributable to MDC Partners Inc., net of taxes										(271		)
	Net Loss										(29,711		)	Net loss										(7,484		)
	Net income attributable to the non-controlling interests	(2,293		)	(87		)	—			(2,380		)	Net income attributable to the noncontrolling interests	(1,390		)	28			—			(1,362		)
	Net loss attributable to MDC Partners Inc.										$	(32,091	)	Net loss attributable to MDC Partners Inc.										$	(8,846	)
	Stock based compensation	$	2,524		$	1,121		$	800		$	4,445		Stock based compensation	$	2,139		$	1,277		$	952		$	4,368
	Supplemental Segment Information:													Supplemental Segment Information:
	Capital expenditures	$	5,330		$	258		$	68		$	5,656		Capital expenditures	$	1,702		$	253		$	541		$	2,496
	Goodwill and intangibles	$	553,066		$	363,156		$	—		$	916,222		Goodwill and intangibles	$	522,170		$	424,485		$	—		$	946,655
	Total Assets	$	918,200		$	565,411		$	156,514		$	1,640,125		Total Assets	$	860,571		$	573,308		$	136,393		$	1,570,272
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area	A summary of the Company’s revenue by geographic area, based on the location in which the services originated, is set forth in the following table:
		United			Canada			Other			Total
		States
	Revenue
	Three Months Ended March 31,
	2015	$	252,018		$	29,825		$	20,379		$	302,222
	2014	$	228,833		$	30,913		$	15,108		$	274,854

Significant_Accounting_Policie3

Significant Accounting Policies (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Beginning Balance	$194,951	$148,534
Redemptions	-1,729	-4,820
Granted	5,704	13,327
Changes in redemption value	4,290	38,850
Currency Translation Adjustments	-878	-940
Ending Balance	$202,338	$194,951

Significant_Accounting_Policie4

Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended		9 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014	Dec. 31, 2014	Mar. 28, 2012
Significant Accounting Policies [Line Items]
Interest Rate Percentage On Senior Notes	6.75%
Put option noncontrolling interest impairment charge	$0
Restricted Cash and Cash Equivalents	6,211,000			6,461,000
Cost Method Investments	10,420,000			10,196,000
Consolidated Accounts Receivable Percentage	10.00%			10.00%
Consolidated Largest Client Revenue		10.00%	10.00%
Business Acquisition, Increase (Decrease) in Contingent Purchase Price Obligation	2,248,000	8,022,000
Business Combination, Acquisition Related Costs	874,000	1,071,000
Assets	1,640,125,000	1,570,272,000		1,648,890,000
Liabilities	1,836,706,000			1,802,519,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0
Common Class A
Significant Accounting Policies [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	751,618
Doner [Member]
Significant Accounting Policies [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage					30.00%
Assets	154,855,000			223,305,000
Liabilities	$125,670,000			$192,340,000
Aggregate 2012 Acquisitions [Member] | Doner [Member]
Significant Accounting Policies [Line Items]
Ownership Interest Percentage Increase On Exercise Of Option					70.00%
Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Equity Method Investment, Ownership Percentage	50.00%
Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Equity Method Investment, Ownership Percentage	50.00%
Real Estate Joint Venture [Member]
Significant Accounting Policies [Line Items]
Percentage Of Undivided Interest	30.00%

Loss_Per_Common_Share_Details

Loss Per Common Share (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator
Numerator for basic loss per common share - loss from continuing operations	($23,417)	($7,213)
Net income attributable to the noncontrolling interests	-2,380	-1,362
Net loss attributable to MDC Partners Inc. common shareholders from continuing operations	-25,797	-8,575
Effect of dilutive securities	0	0
Numerator for diluted loss per common share - loss attributable to MDC Partners Inc. common shareholders from continuing operations	($25,797)	($8,575)
Denominator
Denominator for basic loss per common share - weighted average common shares	49,754,961	49,338,332
Effect of dilutive securities	0	0
Denominator for diluted loss per common share - adjusted weighted shares and assumed conversions	49,754,961	49,338,332
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share)	($0.52)	($0.17)
Income (loss) from continuing operations attributable to MDC Partners Inc. common shareholders (usd per share)	($0.52)	($0.17)

Loss_Per_Common_Share_Details_

Loss Per Common Share (Details Textual)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	944,835	1,113,210
Restricted Stock Units (RSUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	832,335	1,000,710

Acquisitions_Details

Acquisitions (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013
Business Combinations [Abstract]
Net loss attributable to MDC Partners Inc.	($32,091)	($8,846)	($32,091)	($8,846)
Transfers from the noncontrolling Interest:
Decrease in MDC Partners Inc. paid in capital for purchase of equity interests in excess of Redeemable Noncontrolling Interests and Noncontrolling Interests			-2,917	-4,798
Net transfers from noncontrolling interest			-2,917	-4,798
Change from net loss attributable to MDC Partners Inc. and transfers to non controlling interest			($35,008)	($13,644)

Acquisitions_Details_Textual

Acquisitions (Details Textual) (USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2014	Feb. 14, 2014	Aug. 01, 2014	Aug. 18, 2014	Jun. 03, 2014	Jul. 31, 2014
Business Acquisition [Line Items]
Business Acquisition, Increase (Decrease) In Contingent Purchase Price Obligation	$2,248	$8,022
Redeemable Noncontrolling Interest, Equity, Fair Value	202,338	194,951	194,951	148,534
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
Aggregate 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price			151,202
Business Acquisition, Cost of Acquired Entity, Cash Paid			67,236
Business Acquisition, Deferred Acquisition Consideration			83,966
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets			61,906
Business Acquisition, Purchase Price Allocation, Goodwill Amount			149,234
Nonredeemable Noncontrolling Interest			50,552
Redeemable Noncontrolling Interest, Equity, Fair Value			13,327
Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount			149,232
Aggregate 2014 Acquisitions [Member] | Luntz Global Partners L L C
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					60.00%
Aggregate 2014 Acquisitions [Member] | Kingsdale Partners LP
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired						65.00%
Aggregate 2014 Acquisitions [Member] | Hunter PR LLC [Member] [Domain]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired							65.00%
Aggregate 2014 Acquisitions [Member] | Albion Brand Communications Limited [Member] [Domain] [Domain]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								75.00%
Aggregate 2014 Acquisitions [Member] | The House Worldwide Ltd [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									100.00%
Trapeze Media Limited | Union Advertising Canada LC [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired										100.00%
Union Advertising Canada LC [Member] | Trapeze Media Limited
Business Acquisition [Line Items]
Business Combination, Step Acquisition Gain on sale of ownership percentage			$908
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners										18.00%
Minimum [Member] | Aggregate 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years
Maximum [Member] | Aggregate 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years

Accruals_and_Other_Liabilities2

Accruals and Other Liabilities (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accrued and Other Liabilities [Abstract]
Beginning balance	$6,014	$5,210
Income attributable to noncontrolling interests	2,380	6,890
Distributions made	-2,839	-6,523
Cumulative translation adjustments		437
Other	-116
Ending balance	$5,439	$6,014

Accruals_and_Other_Liabilities3

Accruals and Other Liabilities (Details Textual) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accrued and Other Liabilities [Abstract]
Accrued Media Cost, Current	$214,435,000	$144,161,000
Other Liabilities	6,173,000	6,419,000
Accrued and Other Liabilities Attributable To Noncontrolling Interest	$5,439,000	$6,014,000	$5,210,000

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Other Assets, Current	$5,622		$5,591
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent	11,378		16,409
Revenue	15,524	17,715
Operating loss	-1,552	-161
Other expense	-72	-110
Loss on disposal	-4,670	0
Net loss from discontinued operations attributable to MDC Partners Inc., net of taxes	($6,294)	($271)

Debt_Details

Debt (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Debt [Line Items]
Revolving credit agreement	$19,602,000	$0
Original issue premium	6,722,000	7,017,000
Debt, Long-term and Short-term, Combined Amount, Total	761,324,000	742,017,000
Obligations under capital leases	1,007,000	1,110,000
Debt and Capital Lease Obligations	762,331,000	743,127,000
Less current portion:	532,000	534,000
Long-term Debt, Excluding Current Maturities, Total	761,799,000	742,593,000
Notes due 2020
Debt [Line Items]
Senior Notes	$735,000,000	$735,000,000

Debt_Details_Textual

Debt (Details Textual) (USD $)	3 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 20, 2013	Dec. 31, 2013	Nov. 15, 2013	Apr. 02, 2014	Oct. 23, 2014	Dec. 31, 2014
Debt [Line Items]
Long-term Line of Credit, Noncurrent	$19,602,000							$0
Interest Paid	367,000	334,000
Letters of Credit Outstanding, Amount	4,803,000
Accounts Payable, Total	40,044,000							72,147,000
6.75% Notes
Debt [Line Items]
Debt Instrument, Face Amount			550,000
Debt instrument, stated interest rate	6.75%		6.75%
Debt Instrument, Maturity Year			2020
Debt Instrument, Maturity Date			1-Apr-20
Proceeds from Offering			537,600,000
Debt Instrument, Redemption Date, One	1-Apr-16
Debt Instrument, Redemption Date, Two	1-Apr-17
Debt Instrument, Redemption Date, Latest For Redemption At Face Amount	1-Apr-18
Debt Instrument, Percentage Of Redemption Price, Redemption Date One	103.38%
Debt Instrument, Percentage Of Redemption Price, Redemption Date Two	101.69%
Debt Instrument, Percentage Of Redemption Price, Redemption Date, Latest For Redemption At Face Amount	100.00%
Debt Instrument, Percentage Redeemable Redemption Date, Additional	106.75%
Debt Instrument, Percentage Of Redemption Price Redemption Date, Additional	35.00%
Debt Instrument, Percentage Of Redemption Price, Change In Ownership Control	101.00%
11% Notes
Debt [Line Items]
Debt instrument, stated interest rate			11.00%
Loss on redemption of notes				55,588,000
6.75% Notes issued in November 2013
Debt [Line Items]
Debt instrument, stated interest rate					6.75%
Additional borrowing face amount					110,000,000
Proceeds from Offering					111,925,000
Debt Instrument, Unamortized Premium					4,125,000
Expense Related to Distribution or Servicing and Underwriting Fees					2,200,000
6.75% Notes Issued in April 2014
Debt [Line Items]
Debt instrument, stated interest rate						6.75%
Additional borrowing face amount						75,000,000
Proceeds from Offering						77,452,000
Debt Instrument, Unamortized Premium						3,938,000
Expense Related to Distribution or Servicing and Underwriting Fees						1,500,000
Wells Fargo Capital Finance, LLC
Debt [Line Items]
Line of Credit Facility, Increase (Decrease), Net							100,000,000
Long-term Line of Credit			225,000,000
Debt Instrument, Maturity Date							30-Sep-19
Debt Instrument, Face Amount							$325,000,000
Line of Credit Facility, Description			31-Dec-18
Wells Fargo Capital Finance, LLC | Base Rate
Debt [Line Items]
Debt instrument, stated interest rate	1.00%						1.00%
Wells Fargo Capital Finance, LLC | London Interbank Offered Rate (LIBOR)
Debt [Line Items]
Debt instrument, stated interest rate	1.75%						1.75%

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (6.75% Notes, USD $)	Sep. 30, 2014	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Liabilities:
Debt instrument, stated interest rate	6.75%
Fair Value, Inputs, Level 1
Liabilities:
Long term debt, Carrying Amount		$741,722	$742,017
Long term debt, Fair Value		$773,588	$751,538

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 1) (Fair Value, Inputs, Level 3, USD $)	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Inputs, Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance of contingent payments	$172,227		$151,848
Payments	-2,033		-61,441
Grants	2,944	[1]	68,642	[1]
Redemption value adjustments	3,723	[2]	20,816	[2]
Transfers (to) from fixed payments	0		-5,146
Foreign translation adjustment	-3,055		-2,492
Ending Balance of contingent payments	$173,806		$172,227
[1]	Grants are the initial estimated deferred acquisition payments of new acquisitions completed within that fiscal period.
[2]	Redemption value adjustments are fair value changes from the Company’s initial estimates of deferred acquisition payments, including the accretion of present value and stock based compensation charges relating to acquisition payments that are tied to continued employment.

Fair_Value_Measurements_Detail2

Fair Value Measurements (Details Textual) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]
Deferred Acquisition Consideration, Fixed Payments	$26,998	$33,141
Business Acquisition, Contingent Consideration Potential Cash Payment, Total	$200,804	$205,368

Other_Income_Expense_Details

Other Income (Expense) (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Other Income and Expenses [Abstract]
Other income (expense)	$490	($19)
Foreign currency loss	-18,530	-6,552
Other income (expense), net	($18,040)	($6,571)

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$302,222	$274,854
Cost of services sold	210,419	181,468
Office and general expenses	74,308	71,336
Depreciation and amortization	12,300	10,482
Operating Profit (Loss)	5,195	11,568
Other Income (Expense):
Other income, net	-18,040	-6,571
Interest expense, net	-14,977	-12,619
Loss from continuing operations before income taxes, equity in affiliates	-27,822	-7,622
Income tax benefit	-4,054	-346
Loss from continuing operations before equity in affiliates	-23,768	-7,276
Equity in earnings of non-consolidated affiliates	351	63
Loss from continuing operations	-23,417	-7,213
Loss from discontinuing operations attributable to MDC Partners Inc., net of taxes	-6,294	-271
Net loss	-29,711	-7,484
Net income attributable to the noncontrolling interests	-2,380	-1,362
Net loss attributable to MDC Partners Inc.	-32,091	-8,846	-32,091	-8,846
Stock based compensation	4,445	4,368
Supplemental Segment Information:
Capital expenditures	5,656	2,496
Goodwill and intangibles	916,222	946,655
Total Assets	1,640,125	1,570,272			1,648,890
Strategic Marketing Services
Segment Reporting Information [Line Items]
Revenue	240,436	214,804
Cost of services sold	166,026	140,560
Office and general expenses	49,156	45,046
Depreciation and amortization	6,423	5,148
Operating Profit (Loss)	18,831	24,050
Other Income (Expense):
Net income attributable to the noncontrolling interests	-2,293	-1,390
Stock based compensation	2,524	2,139
Supplemental Segment Information:
Capital expenditures	5,330	1,702
Goodwill and intangibles	553,066	522,170
Total Assets	918,200	860,571
Performance Marketing Services
Segment Reporting Information [Line Items]
Revenue	61,786	60,050
Cost of services sold	44,393	40,908
Office and general expenses	11,154	16,315
Depreciation and amortization	5,430	4,832
Operating Profit (Loss)	809	-2,005
Other Income (Expense):
Net income attributable to the noncontrolling interests	-87	28
Stock based compensation	1,121	1,277
Supplemental Segment Information:
Capital expenditures	258	253
Goodwill and intangibles	363,156	424,485
Total Assets	565,411	573,308
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0
Cost of services sold	0	0
Office and general expenses	13,998	9,975
Depreciation and amortization	447	502
Operating Profit (Loss)	-14,445	-10,477
Other Income (Expense):
Net income attributable to the noncontrolling interests	0	0
Stock based compensation	800	952
Supplemental Segment Information:
Capital expenditures	68	541
Goodwill and intangibles	0	0
Total Assets	$156,514	$136,393

Segment_Information_Details_1

Segment Information (Details 1) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$302,222	$274,854
Other Segments
Segment Reporting Information [Line Items]
Revenue	20,379	15,108
United States
Segment Reporting Information [Line Items]
Revenue	252,018	228,833
Canada
Segment Reporting Information [Line Items]
Revenue	$29,825	$30,913

Segment_Information_Additional

Segment Information Additional Information (Details)	3 Months Ended
	Mar. 31, 2015
	segment
Strategic Marketing Services [Member]
Segment Reporting Information [Line Items]
Number of Reportable Segments	1
Performance Marketing Services and Corporate [Member]
Segment Reporting Information [Line Items]
Number of Segments, Other	2

Commitments_Contingencies_and_1

Commitments, Contingencies and Guarantees (Details Textual) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Estimated Payments For Put Option Excluding Termination	$21,632
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options	87
Estimated Payment for Put Options Upon Termination	180,706
Estimated Aggregate Amount For Put Options	202,338
Investment Commitments	8,588
Letters of Credit Outstanding, Amount	$4,803

Subsequent_Events_Details

Subsequent Events (Details) (Perquisite Repayment [Member], USD $)	1 Months Ended
	Apr. 30, 2015
Perquisite Repayment [Member]
Subsequent Event [Line Items]
Perquisite Repayment	$8,600