Consent fee per $1000 in principal

No definition available.

Name:	reg_Consentfeeper1000inprincipal
Namespace Prefix:	reg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Discount Percent

+ References

No definition available.

+ Details

Name:	reg_DebtInstrumentDiscountPercent
Namespace Prefix:	reg_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Number of Tranches

+ References

No definition available.

+ Details

Name:	reg_DebtInstrumentNumberofTranches
Namespace Prefix:	reg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Tranche Value

+ References

No definition available.

+ Details

Name:	reg_DebtInstrumentTrancheValue
Namespace Prefix:	reg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility, Increase in Capacity

+ References

No definition available.

+ Details

Name:	reg_LineofCreditFacilityIncreaseinCapacity
Namespace Prefix:	reg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage of debt instrument holders giving consent

+ References

No definition available.

+ Details

Name:	reg_Percentageofdebtinstrumentholdersgivingconsent
Namespace Prefix:	reg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Preferred Stock, Redemption Value

+ References

No definition available.

+ Details

Name:	reg_PreferredStockRedemptionValue
Namespace Prefix:	reg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

Name:	us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockLiquidationPreferenceValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_TotalnotesissuedinJanuaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_NotesDueFebruary12047Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_TotalnotesissuedinJuneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_NotesMaturing2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableToBanksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_NotesDueDecember22020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=reg_Series6Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=reg_EquityOneInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_PrivatePlacementNotesMaturing2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_EquityOneTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_EquityOneTermLoan1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_FixedRateMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_VariableRateMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=reg_AccordionFeatureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	reg_DebtTrancheAxis=reg_TrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=reg_NotesDue2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	reg_DebtTrancheAxis=reg_TrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	reg_ScheduledPrincipalPaymentsAndMaturitiesAxis=reg_MortgageLoanMaturitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=reg_Series7Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Notes Payable and Unsecured Credit Facilities Narrative (Details)			4 Months Ended	6 Months Ended
	Mar. 01, 2017 USD ($) tranche	Feb. 16, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jan. 31, 2017 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Two			$ 150,617,000	$ 150,617,000
2017			5,372,000	5,372,000
Senior Notes [Member] \| Total notes issued in January [Member]
Debt Instrument [Line Items]
Face amount						$ 650,000,000.0
Senior Notes [Member] \| Notes Due February 1, 2047 [Member]
Debt Instrument [Line Items]
Face amount						300,000,000
Senior Notes [Member] \| Total notes issued in June [Member]
Debt Instrument [Line Items]
Face amount			$ 300,000,000.0	$ 300,000,000.0
Senior Notes [Member] \| Notes Maturing 2022 [Member]
Debt Instrument [Line Items]
Percentage of debt instrument holders giving consent			96.00%	96.00%
Face amount			$ 300,000,000.0	$ 300,000,000.0
Stated rate			3.75%	3.75%
Consent fee per $1000 in principal			$ 1.50	$ 1.50
Term Loans [Member] \| Notes Due December 2, 2020 [Member]
Debt Instrument [Line Items]
Face amount	$ 300,000,000
Interest rate floor	1.824%
Series 6 [Member]
Debt Instrument [Line Items]
Preferred Stock, Redemption Value		$ 250,000,000
Preferred Stock, Dividend Rate, Percentage		6.625%
Equity One Inc. [Member] \| Senior Notes [Member] \| Notes Maturing 2022 [Member]
Debt Instrument [Line Items]
Stated rate	3.75%
Debt assumed in acquisition	$ 300,000,000
Equity One Inc. [Member] \| Senior Notes [Member] \| Private Placement Notes Maturing 2026 [Member]
Debt Instrument [Line Items]
Debt assumed in acquisition	$ 200,000,000
Number of tranches \| tranche	2
Tranche value	$ 100,000,000
Equity One Inc. [Member] \| Term Loans [Member] \| Equity One Term Loan [Member]
Debt Instrument [Line Items]
Debt repaid			250,000,000
Equity One Inc. [Member] \| Term Loans [Member] \| Equity One Term Loan [Member]
Debt Instrument [Line Items]
Debt repaid			300,000,000
Equity One Inc. [Member] \| Mortgages [Member] \| Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt assumed in acquisition	226,300,000
Equity One Inc. [Member] \| Mortgages [Member] \| Variable Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Debt assumed in acquisition	$ 27,800,000
Accordion Feature [Member] \| Equity One Inc. [Member]
Debt Instrument [Line Items]
Increase in borrowing capacity			1,000,000,000
Maximum borrowing capacity			500,000,000	500,000,000
Tranche One [Member] \| Senior Notes [Member] \| Notes Due February 1, 2047 [Member]
Debt Instrument [Line Items]
Face amount						$ 300,000,000.0
Stated rate						4.40%
Discount percent						0.9911
Tranche One [Member] \| Senior Notes [Member] \| Notes Due 2027 [Member]
Debt Instrument [Line Items]
Face amount						$ 350,000,000
Stated rate						3.60%
Discount percent						0.99741
Tranche One [Member] \| Equity One Inc. [Member] \| Senior Notes [Member] \| Private Placement Notes Maturing 2026 [Member]
Debt Instrument [Line Items]
Stated rate	3.81%
Tranche Two [Member] \| Senior Notes [Member] \| Notes Due February 1, 2047 [Member]
Debt Instrument [Line Items]
Face amount			$ 125,000,000.0	$ 125,000,000.0
Stated rate			4.40%	4.40%
Discount percent			1.00784	1.00784
Tranche Two [Member] \| Senior Notes [Member] \| Notes Due 2027 [Member]
Debt Instrument [Line Items]
Face amount			$ 175,000,000	$ 175,000,000
Stated rate			3.60%	3.60%
Discount percent			1.00379	1.00379
Tranche Two [Member] \| Equity One Inc. [Member] \| Senior Notes [Member] \| Private Placement Notes Maturing 2026 [Member]
Debt Instrument [Line Items]
Stated rate	3.91%
Mortgage Loan Maturities [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Year Two			$ 139,976,000	$ 139,976,000
2017			0	0
Minimum [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Face amount			$ 112,000,000	$ 112,000,000
Stated rate			7.00%	7.00%
Minimum [Member] \| Equity One Inc. [Member] \| Mortgages [Member] \| Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Stated rate	3.76%
Maximum [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Stated rate			7.80%	7.80%
Maximum [Member] \| Equity One Inc. [Member] \| Mortgages [Member] \| Fixed Rate Mortgage Loans [Member]
Debt Instrument [Line Items]
Stated rate	7.94%
Parent Company [Member]
Debt Instrument [Line Items]
Debt assumed in acquisition				$ 757,399,000	$ 0
Parent Company [Member] \| Series 6 [Member]
Debt Instrument [Line Items]
Preferred Stock, Liquidation Preference, Value			$ 250,000,000	250,000,000
Preferred Stock, Redemption Value			252,000,000	$ 252,000,000
Preferred Stock, Dividend Rate, Percentage				6.625%
Parent Company [Member] \| Series 7 [Member]
Debt Instrument [Line Items]
Preferred Stock, Liquidation Preference, Value			75,000,000	$ 75,000,000
Preferred Stock, Redemption Value			$ 75,700,000.0	$ 75,700,000.0
Preferred Stock, Dividend Rate, Percentage				6.00%