Accrued and Other Liabilities - Textual (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities and Other Liabilities [Abstract]
Outstanding Checks	$ 40,271	$ 41,989
Trust liability	0	4,632
Accrued and Other Liabilities Attributable To Noncontrolling Interest	$ 9,278	$ 11,030	$ 4,154

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