The percentage of home sites expected to be sold to each joint venture partner.

No definition available.

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- Definition

Guarantor obligations, recourse provision

+ References

No definition available.

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- Definition

Home sites sold

+ References

No definition available.

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Data Type:	xbrli:integerItemType
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- Definition

Investments in and advances to unconsolidated entities.

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No definition available.

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Data Type:	xbrli:stringItemType
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Represents the excess (deficiency) of revenue from the sale of land over the cost to acquire, which is recognized in other nonoperating income.

+ References

No definition available.

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Number of unconsolidated joint ventures, in which the Company has an interest.

+ References

No definition available.

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Period Type:	instant

- Definition

Real Estate Owned & Distressed Loans, Sales

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Reduction in inventory basis for prior deferred gain upon purchase of partnership interest

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No definition available.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

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-Name Accounting Standards Codification
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-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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This element represents disclosure of the amount of gain which has been deferred as the result of the sale of a business or operating assets to a highly leveraged entity which deferred gain has been reflected in the accompanying statement of financial position as reduction from the related asset.

+ References

No definition available.

+ Details

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- Definition

Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Paragraph 3
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Amount of gain (loss) on sale or disposal of an equity method investment.

+ References

No definition available.

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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Revenue related to the sale of homes and home building activities including design, development, general contracting, and renovation services for residential buildings, including single-family houses, multifamily housing, townhouses, apartments, and modular housing.

+ References

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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-SubTopic 10
-Section 35
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e25351-111560

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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Balance Type:	debit
Period Type:	instant

- Definition

Revenue from the sale of land in the reporting period.

+ References

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Balance Type:	credit
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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

- Definition

Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

+ References

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Period Type:	duration

- Definition

The level of ownership or equity interest acquired in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 5
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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Total distributions to each class of partners (i.e., general, limited and preferred partners).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-Paragraph 5
-Subparagraph (SAB Topic 4.F)
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow from the acquisition of a piece of land and anything permanently fixed to it, including buildings, structures on it and so forth, and payments to develop real estate assets by adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements. Including real estate intended to generate income for the owner; excluding real estate acquired for use by the owner.

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Period Type:	duration

- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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Period Type:	duration

- Definition

The cash outflow from the purchase of ownership in a partnership, the purpose of which is to construct, sell, hold or invest in real estate.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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- Definition

Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Balance Type:	debit
Period Type:	duration

- Definition

Amount of deferred gross profit, realized on retail land sale transaction accounted for under the installment method.

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-Paragraph 10
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Data Type:	xbrli:monetaryItemType
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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Investments in Unconsolidated Entities (Details Textual)			1 Months Ended		3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended			35 Months Ended
	Apr. 28, 2017 USD ($)	Jan. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2017 USD ($) joint_ventures rental_units home_sites	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jan. 31, 2016 USD ($)	Apr. 30, 2017	Jul. 31, 2015 USD ($)	Oct. 31, 2017 USD ($) joint_ventures rental_units home_sites Homes_sold	Oct. 31, 2016 USD ($) home_sites Homes_sold	Oct. 31, 2015 USD ($)	Mar. 08, 2016 USD ($)	Nov. 01, 2017 USD ($)	Apr. 15, 2016 USD ($)
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Income (loss) from unconsolidated entities															$ 116,066,000	$ 40,748,000	$ 21,119,000
Equity Method Investment, Summarized Financial Information, Revenue															889,309,000	374,815,000	248,795,000
Investments in unconsolidated entities					$ 481,758,000				$ 496,411,000						481,758,000	496,411,000
Home Building Revenue					2,027,907,000	$ 1,502,909,000	$ 1,363,512,000	$ 920,730,000	1,855,451,000	$ 1,269,934,000	$ 1,115,557,000	$ 928,566,000			5,815,058,000	5,169,508,000	4,171,248,000
Funding Commitments to Joint Ventures					52,492,000										52,492,000
Secured Debt					139,116,000				122,570,000						139,116,000	122,570,000
Line of Credit Facility, Maximum Borrowing Capacity					1,680,900,000										1,680,900,000
Payments to Acquire Equity Method Investments															122,334,000	69,655,000	123,940,000
Amounts borrowed under commitments					1,199,600,000										1,199,600,000
Escrow cash held by our captive title company					$ 45,923,000				138,633,000						45,923,000	138,633,000
Land Sales															$ 284,928,000	85,268,000	183,870,000
Number of Joint Ventures \| joint_ventures					30										30
Proceeds from Equity Method Investment, Distribution															$ 134,291,000	15,287,000	19,459,000
Land sales, net															8,621,000	13,327,000	13,150,000
Management Fees Revenue															$ 12,902,000	10,270,000	11,299,000
Rental Property Joint Venture Boston Suburb [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units					390										390
Line of Credit Facility, Maximum Borrowing Capacity					$ 91,000,000										$ 91,000,000
Amounts borrowed under commitments					11,100,000										11,100,000
Rental Property Joint Ventures Northern New Jersey [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					70,000,000										70,000,000
Amounts borrowed under commitments					61,300,000										61,300,000
Rental Property Joint Venture Suburban Philadelphia [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Long-term Debt					56,000,000										56,000,000
Debt Instrument, Term		10 years
Rental Property Joint Ventures Jersey City [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Long-term Debt					$ 133,000,000										$ 133,000,000
Debt Instrument, Term	10 years
Land Development Joint Venture, Irvine, California [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| home_sites					840										840
Expected Percentage Of Homes To Be Sold To Each Joint Venture Partner															50.00%
Secured Debt									$ 320,000,000							$ 320,000,000
Line of Credit Facility, Maximum Borrowing Capacity					$ 200,000,000										$ 200,000,000
Payments to Acquire Equity Method Investments				$ 80,000,000
Amounts borrowed under commitments					153,200,000										$ 153,200,000
Home Building Joint Ventures, Total [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| Homes_sold															197	115
Equity Method Investment, Summarized Financial Information, Revenue															$ 475,300,000	$ 164,900,000
Line of Credit Facility, Maximum Borrowing Capacity					382,600,000										382,600,000
Amounts borrowed under commitments					173,300,000										173,300,000
Home Building Joint Venture Metro New York Four [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					236,500,000										236,500,000
Amounts borrowed under commitments					$ 118,400,000										$ 118,400,000
Rental Joint Ventures, including Trusts i and II [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures					13										13
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,059,100,000										$ 1,059,100,000
Amounts borrowed under commitments					$ 803,300,000										$ 803,300,000
Rental Property Joint Ventures Metro Washington, D.C. [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property					525										525
Line of Credit Facility, Maximum Borrowing Capacity					$ 130,600,000										$ 130,600,000
Amounts borrowed under commitments					$ 17,700,000										$ 17,700,000
Toll Brothers Realty Trust [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage					33.30%										33.30%
Toll Brothers Realty Trust [Member] \| Management [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage					33.30%										33.30%
Home Building Joint Venture Metro New York Five [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity					$ 144,000,000										$ 144,000,000
Amounts borrowed under commitments					$ 52,700,000										$ 52,700,000
Rental Property Joint Venture Princeton Junction [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property					232										232
Line of Credit Facility, Maximum Borrowing Capacity					$ 41,700,000										$ 41,700,000
Amounts borrowed under commitments					0										0
Rental Property Joint Venture Metro New York [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Long-term Debt					80,000,000										$ 80,000,000
Debt Instrument, Term															3 years
Rental Property Joint Venture Metro New York [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 35,900,000										$ 35,900,000
Ownership Percentage					50.00%										50.00%
Rental Property Joint Ventures Northern New Jersey [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Guarantor obligations, recourse provision					100.00%								25.00%
Rental Property Joint Venture Princeton Junction [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 4,500,000										$ 4,500,000
Retail Land Sales, Installment Method, Gross Profit, Deferred															$ 2,996,000
Payments to Acquire and Develop Real Estate					$ 13,600,000
Rental Property Joint Venture Princeton Junction [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage					75.00%										75.00%
Land Sales					$ 10,200,000
Home Building Joint Venture Metro New York Five [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 26,900,000										$ 26,900,000
Ownership Percentage					25.00%										25.00%
Proceeds from Sale of Real Estate					$ 115,900,000
Payments to Acquire and Develop Real Estate					143,800,000
Rental Property Joint Ventures Jersey City [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 7,400,000										$ 7,400,000
Ownership Percentage					25.00%				50.00%						25.00%	50.00%
Land Development Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Income (loss) from unconsolidated entities															$ 13,007,000	$ 15,772,000	12,005,000
Home sites sold \| home_sites															1,132	776
Equity Method Investment, Summarized Financial Information, Revenue															$ 288,440,000	$ 142,015,000	128,889,000
Other than Temporary Impairment Losses, Investments															2,000,000	0
Investments in unconsolidated entities					$ 236,062,000				$ 223,483,000						$ 236,062,000	$ 223,483,000
Number of Joint Ventures \| joint_ventures					7										7
Land Development Joint Ventures [Member] \| Equity Method Investee [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| home_sites															364	207
Equity Method Investment, Summarized Financial Information, Revenue															$ 166,500,000	$ 64,200,000
Equity Method Investment, Deferred Gain on Sale															13,500,000	9,300,000
Land Development Joint Ventures [Member] \| Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Funding Commitments to Joint Ventures					$ 33,689,000										33,689,000
Land Development Joint Venture, Irvine, California [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 139,100,000										$ 139,100,000
Ownership Percentage					50.00%										50.00%
Land Development Joint Venture, Irvine, California [Member] \| Equity Method Investee [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| home_sites					94
Equity Method Investment, Summarized Financial Information, Revenue					$ 84,500,000
Land Development Joint Venture, Irvine, California [Member] \| Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Funding Commitments to Joint Ventures					$ 3,400,000										$ 3,400,000
Home Building Joint Venture Metro New York Three [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage					25.00%										25.00%
Payments to Acquire Interest in Joint Venture																15,900,000
Land Sales																	78,500,000
Retail Land Sales, Installment Method, Gross Profit, Deferred														$ 9,300,000			9,260,000
Deferred Revenue, Revenue Recognized															$ 4,723,000	1,546,000
Noncash or Part Noncash Acquisition, Interest Acquired					75.00%
Payments to Acquire Partners Interest in Real Estate Partnership, Net of Cash Acquired					$ 36,800,000
Reduction in inventory basis for prior deferred gain upon purchase of partnership interest					3,000,000										3,000,000
Home Building Joint Venture Metro New York Four [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 30,300,000										$ 30,300,000
Ownership Percentage					20.00%										20.00%
Proceeds from Sale of Real Estate				148,000,000
Escrow cash held by our captive title company									$ 106,100,000							106,100,000
Payments to Acquire and Develop Real Estate				$ 176,000,000
Rental Property Joint Ventures Metro Washington, D.C. [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 30,100,000										$ 30,100,000
Land Sales																38,100,000
Retail Land Sales, Installment Method, Gross Profit, Deferred															2,999,000	$ 2,999,000
Payments to Acquire and Develop Real Estate																		$ 35,100,000
Proceeds from Equity Method Investment, Distribution											18,700,000
Land sales, net										$ 3,000,000
Rental Property Joint Ventures Metro Washington, D.C. [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage									50.00%							50.00%
Land Sales											$ 20,200,000
Rental Property Joint Venture Boston Suburb [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 11,500,000										$ 11,500,000
Ownership Percentage					25.00%										25.00%
Toll Brothers Realty Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Income (loss) from unconsolidated entities																$ 2,000,000	3,500,000
Investments in unconsolidated entities					$ 0										$ 0
Ownership Percentage					33.30%										33.30%
Management Fees Revenue															$ 2,000,000	1,600,000	2,200,000
Partners' Capital Account, Distributions															0	2,000,000	$ 6,100,000
Gibraltar Land Banking & Development Joint Ventures [Member] [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 8,500,000										$ 8,500,000
Ownership Percentage					25.00%										25.00%
Number of Joint Ventures \| joint_ventures					3										3
Gibraltar Land Banking & Development Joint Ventures [Member] [Member] \| Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Funding Commitments to Joint Ventures					$ 100,000,000										$ 100,000,000
Gibraltar Legacy Assets Joint Venture [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 4,000,000										$ 4,000,000
Ownership Percentage					24.00%										24.00%
Gains (Losses) on Sales of Other Real Estate																$ 1,300,000
Real Estate Owned & Distressed Loans, Sales																				$ 24,100,000.00
Gibraltar Legacy Assets Joint Venture [Member] \| Commitment To Advance Or Invest In Affiliates Subsidiaries And Joint Venture [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Funding Commitments to Joint Ventures					$ 9,600,000										$ 9,600,000
Rental Property Joint Venture Suburban Philadelphia [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities					$ 3,100,000										$ 3,100,000
Ownership Percentage					25.00%				50.00%						25.00%	50.00%
Subsequent Event [Member] \| Rental Property Joint Ventures College Park, Maryland [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Land Sales			$ 219,000,000
Subsequent Event [Member] \| Rental Property Joint Ventures College Park, Maryland [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Realized Gain (Loss) on Disposal			30,100,000
Proceeds from Sale of Equity Method Investments			$ 39,300,000
In Planning Phase [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units					8,500										8,500
Lease up Stage [Member] \| Rental Joint Ventures, including Trusts i and II [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units					750										750
Occupied or Ready for Occupancy [Member] \| Rental Joint Ventures, including Trusts i and II [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units					3,200										3,200
Asset under Construction [Member] \| Rental Joint Ventures, including Trusts i and II [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units					2,000										2,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Rental Property Joint Ventures Jersey City [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Realized Gain (Loss) on Disposal							$ 20,500,000
Proceeds from Sale of Equity Method Investments	$ 42,900,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Rental Property Joint Venture Suburban Philadelphia [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Realized Gain (Loss) on Disposal								6,200,000
Proceeds from Sale of Equity Method Investments		$ 12,000,000
Line of Credit [Member] \| Rental Property Joint Venture Suburban Philadelphia [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Amounts borrowed under commitments		$ 54,100,000						$ 54,100,000
Line of Credit [Member] \| Rental Property Joint Ventures Jersey City [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Amounts borrowed under commitments	$ 112,200,000
Line of Credit [Member] \| Subsequent Event [Member] \| Rental Property Joint Ventures College Park, Maryland [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Line of Credit Facility, Maximum Borrowing Capacity																			$ 110,000,000