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Significant Accounting Policies - Redeemable Noncontrolling Interest (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Redeemable Noncontrolling Interest [Roll Forward]
Beginning Balance as of January 1,	$ 148,534	$ 117,953	$ 107,432
Redemptions	(4,820)	(4,270)	(16,712)
Granted	13,327	0	4,189
Changes in redemption value	38,850mdca_ChangesInRedemptionValue	35,689mdca_ChangesInRedemptionValue	22,912mdca_ChangesInRedemptionValue
Currency translation adjustments	(940)	(838)	132
Ending Balance as of December 31,	$ 194,951	$ 148,534	$ 117,953

The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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