Guarantor obligations, recourse provision

No definition available.

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Period Type:	duration

- Definition

Home sites sold

+ References

No definition available.

+ Details

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

- Definition

Investments in and advances to unconsolidated entities.

+ References

No definition available.

+ Details

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Namespace Prefix:	tol_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ Details

Name:	tol_Landsalesearningsnet
Namespace Prefix:	tol_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The Company's maxiumum obligation on amounts borrowed by the Company's joint ventures loan commitments as of the balance sheet date which are subject to guarantees by the Company.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	tol_
Data Type:	xbrli:integerItemType
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Period Type:	instant

- Definition

Number of joint ventures formed in current year

+ References

No definition available.

+ Details

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

- Definition

Real Estate Owned & Distressed Loans, Sales

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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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Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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- Definition

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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Period Type:	duration

- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 3
-Subparagraph (a)(1)
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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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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- Definition

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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-Paragraph 1
-Subparagraph (SX 210.9-04.14(d))
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- Definition

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
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-Paragraph 34
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Balance Type:	debit
Period Type:	duration

- 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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Balance Type:	credit
Period Type:	duration

- Definition

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

- Definition

Revenue from the sale of land in the reporting period.

+ References

+ Details

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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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

+ Details

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

- Definition

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
-Publisher FASB
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-SubTopic 210
-Section S99
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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

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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

+ Details

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

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- 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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-Name Accounting Standards Codification
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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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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.

+ Details

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

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
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-Paragraph 1
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
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Period Type:	duration

- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Paragraph 13
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- 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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-Paragraph 13
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- Definition

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.

+ References

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-Name Accounting Standards Codification
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-Paragraph 12
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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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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

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Balance Type:	debit
Period Type:	instant

- 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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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

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- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	tol_AffiliatedEntityAxis=tol_RentalPropertyJointVenturesSuburbanPhiladelphiaandJerseyCityNJMember
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- Details

Name:	tol_AffiliatedEntityAxis=tol_LandDevelopmentJointVentureMember
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- Details

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Investments in Unconsolidated Entities (Details Textual)			1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 11, 2018 USD ($)	Nov. 08, 2018 USD ($)	Nov. 30, 2018 USD ($)	Oct. 31, 2017 USD ($) joint_ventures	Jan. 31, 2015 USD ($)	Apr. 30, 2017	Oct. 31, 2018 USD ($) joint_ventures home_sites rental_units Homes_sold	Oct. 31, 2017 USD ($) joint_ventures home_sites Homes_sold	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Nov. 03, 2018	Jul. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2016 USD ($)
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Income (loss) from unconsolidated entities							$ 85,240,000	$ 116,066,000	$ 40,748,000
Equity Method Investment, Summarized Financial Information, Revenue							640,267,000	889,309,000	374,815,000
Investments in unconsolidated entities				$ 481,758,000			431,813,000	481,758,000
Funding Commitments to Joint Ventures							39,460,000
Line of Credit Facility, Maximum Borrowing Capacity							1,493,122,000
Amounts borrowed under commitments							1,154,265,000
Land Sales							$ 134,327,000	284,928,000	85,268,000
Number of Joint Ventures \| joint_ventures							33
Land sales, net							$ 6,331,000	8,621,000	13,327,000
Management Fees Revenue							11,740,000	$ 12,902,000	$ 10,270,000
Rental Property Joint Ventures Suburban Philadelphia and Jersey City NJ [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Long-term Debt							$ 189,000,000
Number of Real Estate Properties \| joint_ventures				2				2
Land Development Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| home_sites							986	1,132
Line of Credit Facility, Maximum Borrowing Capacity							$ 138,808,000
Amounts borrowed under commitments							126,790,000
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
Amounts borrowed under commitments							$ 70,000,000
Rental Property Joint Ventures Jersey City [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Debt Instrument, Term							10 years
Home Building Joint Ventures, Total [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| Homes_sold							100	197
Equity Method Investment, Summarized Financial Information, Revenue							$ 148,000,000	$ 475,300,000
Line of Credit Facility, Maximum Borrowing Capacity							381,411,000
Amounts borrowed under commitments							$ 287,272,000
Home Building Joint Venture Metro New York Four [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures							2
Line of Credit Facility, Maximum Borrowing Capacity							$ 380,500,000
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							15
Line of Credit Facility, Maximum Borrowing Capacity							$ 972,903,000
Amounts borrowed under commitments							$ 740,203,000
Rental Property Joint Ventures Atlanta GA, Belmont MA, and 2 Washington DC [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures							4
Line of Credit Facility, Maximum Borrowing Capacity							$ 166,100,000
Toll Brothers Realty Trust [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							33.30%
Toll Brothers Realty Trust [Member] \| Management [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							33.30%
Rental Property Joint Venture Princeton Junction [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property							232
Line of Credit Facility, Maximum Borrowing Capacity							$ 41,700,000
Amounts borrowed under commitments							22,100,000
Rental Property Joint Venture Metro New York [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Long-term Debt							$ 80,000,000
Debt Instrument, Term							3 years
Rental Property Joint Ventures Belmont MA and Washington DC [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Amounts borrowed under commitments							$ 21,800,000
Rental Property Joint Ventures College Park MD, Westborough MA, and Washington DC [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Real Estate Properties \| joint_ventures							3
Land Sales							$ 477,500,000
Rental Property Joint Ventures Suburban Philadelphia and Jersey City NJ [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							25.00%		50.00%
Rental Property Joint Ventures College Park MD, Westborough MA, and Washington DC [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Realized Gain (Loss) on Disposal							$ 67,200,000
Proceeds from Sale of Equity Method Investments							79,100,000
Rental Property Joint Ventures Atlanta GA, Belmont MA, and 2 Washington DC [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Payments to Acquire and Develop Real Estate							140,000,000
Rental Property Joint Ventures Atlanta GA, Belmont MA, and 2 Washington DC [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Land Sales							$ 80,300,000
Rental Property Joint Venture Atlanta, Georgia [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							75.00%
Rental Property Joint Venture Metro New York [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities							$ 35,000,000
Ownership Percentage							50.00%
Rental Property Joint Ventures Northern New Jersey [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Guarantor obligations, recourse provision						25.00%	100.00%
Rental Property Joint Venture Princeton Junction [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Retail Land Sales, Installment Method, Gross Profit, Deferred							$ 3,834,000
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%
Land Sales								10,200,000
Land Development Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Income (loss) from unconsolidated entities							$ 3,392,000	13,007,000	$ 15,772,000
Equity Method Investment, Summarized Financial Information, Revenue							351,397,000	288,440,000	$ 142,015,000
Other than Temporary Impairment Losses, Investments							6,000,000	2,000,000
Investments in unconsolidated entities				$ 236,062,000			$ 176,593,000	$ 236,062,000
Number of Joint Ventures \| joint_ventures							7
Land Development Joint Ventures [Member] \| Equity Method Investee [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Home sites sold \| home_sites							259	364
Equity Method Investment, Summarized Financial Information, Revenue							$ 153,200,000	$ 166,500,000
Equity Method Investment, Deferred Gain on Sale							1,700,000	13,500,000
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							19,961,000
Home Building Joint Venture Metro New York Three [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage									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									$ 2,999,000	$ 9,300,000
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]
Proceeds from Sale of Real Estate								263,900,000
Payments to Acquire and Develop Real Estate								319,800,000
Rental Property Joint Ventures Metro Washington, D.C. [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Land Sales									38,100,000
Retail Land Sales, Installment Method, Gross Profit, Deferred								2,996,000
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%
Toll Brothers Realty Trust [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities							$ 0
Ownership Percentage							33.30%
Management Fees Revenue							$ 2,000,000	2,000,000	1,600,000
Partners' Capital Account, Distributions							27,700,000	0	2,000,000
Gibraltar Land Banking & Development Joint Ventures [Member] [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities							$ 12,600,000
Number of Joint Ventures \| joint_ventures							5
Number of joint ventures formed in current fiscal year \| joint_ventures							2
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
Gibraltar Joint Ventures [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Income (loss) from unconsolidated entities							5,575,000	4,262,000	2,310,000
Equity Method Investment, Summarized Financial Information, Revenue							19,592,000	10,090,000	5,929,000
Investments in unconsolidated entities				16,066,000			$ 18,068,000	16,066,000
Ownership Percentage							25.00%
Number of Joint Ventures \| joint_ventures							7
Gibraltar 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							$ 9,621,000
Gibraltar Legacy Assets Joint Venture [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities							$ 3,700,000
Ownership Percentage							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
Rental Property Joint Ventures Belmont MA and 2 Washington D.C. [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							50.00%
Subsequent Event [Member] \| Rental Property Joint Venture Miami FL [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property	293
Subsequent Event [Member] \| Rental Property Joint Venture Harrison NY [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property		421
Line of Credit Facility, Maximum Borrowing Capacity		$ 101,900,000
Subsequent Event [Member] \| Rental Property Joint Venture Boston MA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property											426
Subsequent Event [Member] \| Rental Property Joint Venture Harrison NY [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Investments in unconsolidated entities		$ 12,700,000
Ownership Percentage		25.00%
Maxiumum guarantor obigation for borrowings by JVs		$ 101,900,000
Proceeds from Sale of Real Estate		34,600,000
Payments to Acquire and Develop Real Estate		36,100,000
Land sales, net		$ 8,500,000
Subsequent Event [Member] \| Rental Property Joint Venture Harrison NY [Member] \| Co-venturer [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage		75.00%
Land Sales		$ 35,000,000
Subsequent Event [Member] \| Rental Property Joint Venture Boston MA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage											50.00%
Payments to Acquire Interest in Joint Venture			$ 26,500,000
In Planning Phase [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units							9,450
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							1,400
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							1,750
Asset under Construction [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Number of Units in Real Estate Property \| rental_units							1,350
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							2,800
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] \| Rental Property Joint Ventures Suburban Philadelphia and Jersey City NJ [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Equity Method Investment, Realized Gain (Loss) on Disposal								26,700,000
Proceeds from Sale of Equity Method Investments								54,900,000
Line of Credit [Member] \| Rental Property Joint Ventures Suburban Philadelphia and Jersey City NJ [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Amounts borrowed under commitments													$ 166,300,000
Line of Credit [Member] \| Rental Property Joint Ventures College Park MD, Westborough MA, and Washington DC [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Amounts borrowed under commitments							$ 239,600,000
Rental Property Joint Venture Miami FL [Member] \| Subsequent Event [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Real Estate Investment Property, at Cost	$ 13,200,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	71.00%
Rental Property Joint Venture Woburn MA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Real Estate Investment Property, at Cost												$ 15,900,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage							85.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners							15.00%
Variable Interest Entity, Primary Beneficiary [Member] \| Rental Property Joint Venture Woburn MA [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Variable Interest Entity, Consolidated, Carrying Amount, Assets							$ 19,700,000
Noncontrolling Interest in Variable Interest Entity							$ 2,801,000
Minimum [Member] \| Rental Property Joint Venture Atlanta, Georgia [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							25.00%
Minimum [Member] \| Home Building Joint Venture Metro New York Four [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage				20.00%			20.00%	20.00%
Maximum [Member] \| Home Building Joint Venture Metro New York Four [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							25.00%
Maximum [Member] \| Rental Property Joint Ventures Belmont MA and 2 Washington D.C. [Member]
Investments in and Advances to Unconsolidated Entities (Textual) [Abstract]
Ownership Percentage							50.00%