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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Shares | Additional Paid-in Capital | Accumulated Other Comprehensive (Loss) Income | Retained Earnings | Total Common Shareholders’ Equity | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 769,309 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 43 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 348,667 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (3,913)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 39,317 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 384,114 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 385,195 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in Shares) at Dec. 31, 2011 |  | 42,586,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  | 5,880 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 5,880 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (5,880)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) |  | 334,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of Common Shares, net of issuance costs | 226,721 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts | 9 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 226,712 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 226,721 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 9,510,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Dividends declared | (34,994)us-gaap_DividendsCommonStock |  |  |  | (33,896)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (33,896)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,098)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Issuance of OP Units to acquire real estate | 2,279 akr_IssuanceOfOpUnitsToAcquireRealEstate |  |  |  |  |  | 2,279 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee and trustee stock compensation, net | 6,691 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |  | 666 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 666 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 6,025 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee and trustee stock compensation, net (in Shares) |  | 52,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Noncontrolling interest distributions | (160,663)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  |  |  |  | (160,663)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Noncontrolling interest contributions | 172,228 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest |  |  |  |  |  | 172,228 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance before adjustment toward comprehensive income | 981,571 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome | 52 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 581,925 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (3,913)akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 5,421 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 583,485 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 398,086 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance before adjustment toward comprehensive income (in Shares) |  | 52,482,000 akr_SharesIssuedBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 89,936 us-gaap_ProfitLoss |  |  |  | 39,706 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 39,706 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 50,230 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Unrealized income (loss) on valuation of swap agreements | (3,519)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  | (1,815)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,815)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,704)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Reclassification of realized interest on swap agreements | 2,268 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  | 1,421 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,421 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 847 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Total comprehensive (loss) income | 88,685 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  | (394)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 39,706 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 39,312 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 49,373 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2012 | 1,070,256 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 52 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 581,925 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (4,307)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 45,127 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 622,797 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 447,459 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in Shares) at Dec. 31, 2012 |  | 52,482,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  | 1,548 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,548 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,548)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) |  | 93,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of Common Shares, net of issuance costs | 80,690 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts | 4 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 80,686 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 80,690 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 3,013,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Dividends declared | (49,159)us-gaap_DividendsCommonStock |  |  |  | (47,495)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (47,495)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,664)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Issuance of OP Units to acquire real estate | 33,300 akr_IssuanceOfOpUnitsToAcquireRealEstate |  |  |  | 0 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 33,300 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee and trustee stock compensation, net | 7,672 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |  | 1,142 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,142 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 6,530 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee and trustee stock compensation, net (in Shares) |  | 55,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Consolidation of previously unconsolidated investments | (33,949)akr_EquityConsolidationofPreviouslyUnconsolidatedInvestments |  |  |  |  |  | (33,949)akr_EquityConsolidationofPreviouslyUnconsolidatedInvestments / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Noncontrolling interest distributions | (87,688)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  |  |  |  | (87,688)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Noncontrolling interest contributions | 49,324 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest |  |  |  |  |  | 49,324 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance before adjustment toward comprehensive income | 1,070,446 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome | 56 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 665,301 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (4,307)akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (2,368)akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 658,682 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 411,764 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance before adjustment toward comprehensive income (in Shares) |  | 55,643,000 akr_SharesIssuedBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 44,640 us-gaap_ProfitLoss |  |  |  | 40,115 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 40,115 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 4,525 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Unrealized income (loss) on valuation of swap agreements | 3,610 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  | 3,541 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 3,541 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 69 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Reclassification of realized interest on swap agreements | 2,892 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  | 1,898 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 1,898 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 994 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Total comprehensive (loss) income | 51,142 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  | 5,439 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 40,115 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 45,554 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 5,588 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2013 | 1,121,588 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 56 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 665,301 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,132 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 37,747 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 704,236 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 417,352 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in Shares) at Dec. 31, 2013 | 55,643,068 us-gaap_CommonStockSharesOutstanding | 55,643,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership | 0 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits |  | 3,181 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 3,181 us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (3,181)us-gaap_StockIssuedDuringPeriodValueConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership (in Shares) |  | 136,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Issuance of Common Shares, net of issuance costs | 357,459 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts | 12 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 357,447 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 357,459 akr_StockIssuedDuringPeriodValueNetOfIssuanceCosts / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Issuance of Common Shares, net of issuance costs (in Shares) |  | 12,237,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Dividends declared | (82,279)us-gaap_DividendsCommonStock |  |  |  | (77,194)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (77,194)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (5,085)us-gaap_DividendsCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Issuance of OP Units to acquire real estate | 44,051 akr_IssuanceOfOpUnitsToAcquireRealEstate |  |  |  |  |  | 44,051 akr_IssuanceOfOpUnitsToAcquireRealEstate / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee and trustee stock compensation, net | 8,460 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures |  | 1,932 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,932 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 6,528 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Employee and trustee stock compensation, net (in Shares) |  | 93,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Noncontrolling interest distributions | (218,152)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders |  |  |  |  |  | (218,152)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Noncontrolling interest contributions | 57,969 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest |  |  |  |  |  | 57,969 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance before adjustment toward comprehensive income | 1,289,096 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome | 68 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,027,861 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 1,132 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (39,447)akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 989,614 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 299,482 akr_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance before adjustment toward comprehensive income (in Shares) |  | 68,109,000 akr_SharesIssuedBeforeComprehensiveIncome / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |
Net income | 152,146 us-gaap_ProfitLoss |  |  |  | 71,064 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 71,064 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 81,082 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Unrealized income (loss) on valuation of swap agreements | (9,061)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |  |  | (7,814)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (7,814)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,247)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Reclassification of realized interest on swap agreements | 3,776 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax |  |  | 2,677 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 2,677 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 1,099 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Total comprehensive (loss) income | 146,861 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  | (5,137)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 71,064 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 65,927 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 80,934 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at Dec. 31, 2014 | $ 1,435,957 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 68 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,027,861 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (4,005)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 31,617 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1,055,541 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 380,416 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance (in Shares) at Dec. 31, 2014 | 68,109,287 us-gaap_CommonStockSharesOutstanding | 68,109,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |

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