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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | $ 6,586 |
Interest Rate Movement Effect | 6,080 |
Servicing Rights Value | 8,133 |
Security Price Change | (5,216) |
Total Fair Value Measurement Gain/(Loss) | 15,583 | $ 14,111
Senior Notes due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 598,925 | 598,301
Senior Notes Due Two Thousand Thirty [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 918,470 | 0
Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 1,517,395 | 598,301
Level 2 | Fair Value, Measurements, Recurring | Senior Notes due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes fair value | 630,000 | 626,520
Level 2 | Fair Value, Measurements, Recurring | Senior Notes Due Two Thousand Thirty [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes fair value | 982,620 | 0
Level 2 | Fair Value, Measurements, Recurring | Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior Notes fair value | 1,612,620 | 626,520
Home Building |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Senior notes | 1,517,395 | 598,301
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | 3,227 |
Interest Rate Movement Effect | 3,263 |
Servicing Rights Value | 4,267 |
Security Price Change | 0 |
Total Fair Value Measurement Gain/(Loss) | 10,757 |
Derivative, Notional Amount | 617,308 |
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | 0 |
Interest Rate Movement Effect | 0 |
Servicing Rights Value | 0 |
Security Price Change | (5,216) |
Total Fair Value Measurement Gain/(Loss) | (5,216) |
Derivative, Notional Amount | 916,588 |
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Mortgages held for sale |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assumed Gain/(Loss) From Loan Sale | 3,359 |
Interest Rate Movement Effect | 2,817 |
Servicing Rights Value | 3,866 |
Security Price Change | 0 |
Total Fair Value Measurement Gain/(Loss) | 10,042 | 7,019
Derivative, Notional Amount | $ 439,718 | $ 485,106

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + 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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