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Fair Value - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total fair value measurement gain/(loss) |  |  | $ 17,823 |  | $ 15,583
Home Building Segment |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes carrying value | $ 1,516,830 |  | 1,516,830 |  | 1,517,395
Home Building Segment | Senior Notes due 2022 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes carrying value | 599,238 |  | 599,238 |  | 598,925
Home Building Segment | 3.00% Senior Notes due 2030 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes carrying value | 917,592 |  | 917,592 |  | 918,470
Home Building Segment | Senior Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes carrying value | 1,516,830 |  | 1,516,830 |  | 1,517,395
Home Building Segment | Level 2 | Fair Value, Recurring | Senior Notes due 2022 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes fair value | 620,220 |  | 620,220 |  | 630,000
Home Building Segment | Level 2 | Fair Value, Recurring | 3.00% Senior Notes due 2030 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes fair value | 953,730 |  | 953,730 |  | 982,620
Home Building Segment | Level 2 | Fair Value, Recurring | Senior Notes |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes fair value | 1,573,950 |  | 1,573,950 |  | 1,612,620
Mortgage Banking | Level 2 | Not Designated as Hedging Instrument |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value adjustment income (expense) | 1,692 | $ (7,018) | 2,240 | $ 3,703 |
Mortgage Banking | Level 2 | Fair Value, Recurring | Rate Lock Commitments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 1,130,241 |  | 1,130,241 |  |
Total fair value measurement gain/(loss) |  |  | 14,728 |  |
Mortgage Banking | Level 2 | Fair Value, Recurring | Forward Sales Contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 1,263,416 |  | 1,263,416 |  |
Total fair value measurement gain/(loss) |  |  | (1,604) |  |
Mortgage Banking | Level 2 | Fair Value, Recurring | Mortgages Held for Sale |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Trade and loans receivables held-for-sale, net, not part of disposal group | 344,680 |  | 344,680 |  | 449,760
Fair Value, principal amount, loans held for sale | $ 339,981 |  | 339,981 |  | 439,718
Fair value, option, changes in fair value, gain (loss) |  |  | $ 4,699 |  | $ 10,042

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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