Accruals and Other Liabilities (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued and Other Liabilities [Abstract]
Accrued Media Cost, Current	$ 169,460	$ 201,872
Accrued and Other Liabilities Attributable To Noncontrolling Interest	5,802	4,154	$ 5,473
Outstanding Checks	$ 47,430	$ 80,193

Carrying value as of the balance sheet date of accrued and other liabilities attributable to noncontrolling interest during the reporting period.

No definition available.

Name:	mdca_AccruedAndOtherLiabilitiesAttributableToNoncontrollingInterest
Namespace Prefix:	mdca_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant