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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assumed Gain/(Loss) From Loan Sale |  |  | $ 3,393 |  |
Interest Rate Movement Effect |  |  | 757 |  |
Servicing Rights Value |  |  | 8,464 |  |
Security Price Change |  |  | (471) |  |
Total Fair Value Measurement Gain/(Loss) |  |  | 12,143 |  | $ 14,111
Mortgage Banking [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value adjustment income (expense) | $ 1,735 | $ (8,711) | (1,968) | $ 2,842 |
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Rate Lock Commitments [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 791,352 |  | 791,352 |  |
Assumed Gain/(Loss) From Loan Sale |  |  | 1,995 |  |
Interest Rate Movement Effect |  |  | 820 |  |
Servicing Rights Value |  |  | 5,514 |  |
Total Fair Value Measurement Gain/(Loss) |  |  | 8,329 |  |
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Forward Sales Contracts [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 958,681 |  | 958,681 |  |
Security Price Change |  |  | (471) |  |
Total Fair Value Measurement Gain/(Loss) |  |  | (471) |  |
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Mortgages Held for Sale [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assumed Gain/(Loss) From Loan Sale |  |  | 1,398 |  |
Interest Rate Movement Effect |  |  | (63) |  |
Servicing Rights Value |  |  | 2,950 |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  |  | 4,285 |  | 7,019
Fair Value, Principal Amount, Loans Held for Sale | 336,642 |  | 336,642 |  | 485,106
Home Building [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior notes | 1,517,982 |  | 1,517,982 |  | 598,301
Senior notes | 1,517,982 |  | 1,517,982 |  | 598,301
Home Building [Member] | Senior Notes Due Two Thousand Thirty [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior notes | 919,214 |  | 919,214 |  | 0
Senior notes | 919,214 |  | 919,214 |  | 0
Home Building [Member] | Senior Notes [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior notes | 1,517,982 |  | 1,517,982 |  | 598,301
Senior notes | 1,517,982 |  | 1,517,982 |  | 598,301
Home Building [Member] | Senior Notes due 2022 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior notes | 598,768 |  | 598,768 |  | 598,301
Senior notes | 598,768 |  | 598,768 |  | 598,301
Home Building [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Senior Notes Due Two Thousand Thirty [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes fair value | 970,227 |  | 970,227 |  | 0
Senior Notes fair value | 970,227 |  | 970,227 |  | 0
Home Building [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Senior Notes [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes fair value | 1,603,935 |  | 1,603,935 |  | 626,520
Senior Notes fair value | 1,603,935 |  | 1,603,935 |  | 626,520
Home Building [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Senior Notes due 2022 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Senior Notes fair value | 633,708 |  | 633,708 |  | 626,520
Senior Notes fair value | $ 633,708 |  | $ 633,708 |  | $ 626,520

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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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