Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Capital assets and other	$ 45,496	$ 36,449
Net operating loss carry forwards	39,525	41,947
Interest deductions	17,456	21,753
Refinancing charge	5,176mdca_DeferredTaxAssetsRefinancingCharge	10,153mdca_DeferredTaxAssetsRefinancingCharge
Deferred acquisition consideration	5,204	26,779
Stock compensation	1,561	1,433
Pension plan	3,597	0
Unrealized foreign exchange	6,954	2,372
Capital loss carry forwards	14,834	16,180
Accounting reserves	5,135	4,769
Gross deferred tax asset	144,938us-gaap_DeferredTaxAssetsGross	161,835us-gaap_DeferredTaxAssetsGross
Less: valuation allowance	(119,117)	(137,961)
Net deferred tax assets	25,821us-gaap_DeferredTaxAssetsNet	23,874us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Pension plan	0	(1,112)
Deferred finance charges	(386)	(420)
Capital assets	(396)	(178)
Goodwill amortization	(77,603)	(61,859)
Total deferred tax liabilities	(78,385)us-gaap_DeferredIncomeTaxLiabilities	(63,569)us-gaap_DeferredIncomeTaxLiabilities
Disclosed as:
Deferred tax assets	25,480mdca_DisclosedDeferredTaxAssets	23,380mdca_DisclosedDeferredTaxAssets
Deferred tax liabilities	(78,044)mdca_DisclosedDeferredTaxLiabilities	(63,075)mdca_DisclosedDeferredTaxLiabilities
Deferred tax liabilities (assets), net	$ (52,564)us-gaap_DeferredTaxLiabilities	$ (39,695)us-gaap_DeferredTaxLiabilities

The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from deferred acquisition consideration, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

No definition available.