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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 |  |
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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 |

X
- Definition The percentage of home sites expected to be sold to each joint venture partner. + References No definition available. + Details
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- Definition Home sites sold + References No definition available. + Details
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- Definition Investments in and advances to unconsolidated entities. + References No definition available. + Details
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- 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
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- Definition Number of unconsolidated joint ventures, in which the Company has an interest. + References No definition available. + Details
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- 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. + Details
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- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -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 + Details
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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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- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080555-108585 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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