XML 82 R67.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Stockholders' Equity: Stock buyback program (Details) |  |  |  |  |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2016 USD ($) shares | Jan. 29, 2016 $ / shares | Jan. 20, 2016 $ / shares shares | Nov. 13, 2015 USD ($) shares | Oct. 30, 2015 dividend $ / shares | Jan. 20, 2016 shares | Dec. 31, 2015 $ / shares | Sep. 30, 2015 USD ($)
Subsequent events |  |  |  |  |  |  |  |
Authorized amount for accelerated stock repurchase program |  |  |  | $ 400,000,000 |  |  |  |
Accelerated share repurchased, number of shares purchased (shares) | shares |  |  |  | 4,140,788 |  |  |  |
Authorized amount for stock repurchase program |  |  |  | $ 400,000,000 |  |  |  | $ 1,200,000,000
Number of dividends declared | dividend |  |  |  |  | 2 |  |  |
Dividends declared for common stock | $ / shares |  |  |  |  | $ 2.00 |  | $ 6.63 |
Subsequent Event |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |
Authorized amount for accelerated stock repurchase program | $ 400,000,000 |  |  |  |  |  |  |
Accelerated share repurchased, number of shares purchased (shares) | shares | 4,222,193 |  | 970,609 |  |  | 5,111,397 |  |
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share) | $ / shares |  |  | $ 78.26 |  |  |  |  |
Authorized amount for stock repurchase program | $ 400,000,000 |  |  |  |  |  |  |
Dividends declared for common stock | $ / shares |  | $ 0.68 |  |  |  |  |  |

X
- Definition Accelerated Share Repurchase Program, Number of Shares Purchased + References No definition available. + Details
Name: | mac_AcceleratedShareRepurchaseProgramNumberofSharesPurchased
Namespace Prefix: | mac_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Dividends Declared + References No definition available. + Details
Name: | mac_NumberOfDividendsDeclared
Namespace Prefix: | mac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
Name: | us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
Name: | us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
Name: | us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |