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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total fair value measurement gain/(loss)     $ 2,887   $ (7,435)
Home Building Segment          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes carrying value $ 913,496   913,496   914,888
Home Building Segment | Senior Notes due 2030          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes carrying value 913,496   913,496   914,888
Home Building Segment | Level 2 | Fair Value, Recurring | Senior Notes due 2030          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes fair value 751,050   751,050   788,166
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) (32,167) $ (28,828) 10,322 $ (46,258)  
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 2,491,104   2,491,104    
Total fair value measurement gain/(loss)     (13,757)    
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 2,622,053   2,622,053    
Total fair value measurement gain/(loss)     22,989    
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 325,792   325,792   $ 316,806
Fair Value, principal amount, loans held for sale $ 332,137 $ 319,481 332,137 319,481  
Fair value, option, changes in fair value, gain (loss)     $ (6,345) $ (2,675)