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Earnings per Share ("EPS"): (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator
Net income	$ 26,667us-gaap_ProfitLoss	$ 19,644us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	(2,056)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(1,825)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to the Company	24,611us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	17,819us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Allocation of earnings to participating securities	(148)mac_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted	(128)mac_UndistributedEarningsLossAllocatedtoParticipatingSecuritiesBasicandDiluted
Numerator for basic and diluted earnings per share—net income attributable to common stockholders	$ 24,463mac_NetIncomeLossAvailabletoCommonStockholdersafterAllocationtoParticipatingSecuritiesBasicandDiluted	$ 17,691mac_NetIncomeLossAvailabletoCommonStockholdersafterAllocationtoParticipatingSecuritiesBasicandDiluted
Denominator (in shares)
Denominator for basic earnings per share—weighted average number of common shares outstanding	158,336us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	140,767us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Share and unit-based compensation plans	208us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	50us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted earnings per share—weighted average number of common shares outstanding	158,544us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	140,817us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per common share—net income attributable to common stockholders: (in dollars per share)
Basic (in dollars per share)	$ 0.15us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted

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Net Income (Loss) Available to Common Stockholders after Allocation to Participating Securities, Basic and Diluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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