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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total fair value measurement gain/(loss)   $ (28,021)   $ 18,237
Home Building Segment        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior Notes carrying value $ 915,346 915,346   1,516,255
Home Building Segment | Senior Notes due 2022        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior Notes carrying value 0 0   599,553
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 915,346 915,346   916,702
Home Building Segment | Senior Notes        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior Notes carrying value 915,346 915,346   1,516,255
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 0 0   610,452
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 735,804 735,804   942,192
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 735,804 735,804   1,552,644
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) 28,828 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 2,213,239 2,213,239    
Total fair value measurement gain/(loss)   (52,002)    
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 2,446,322 2,446,322    
Total fair value measurement gain/(loss)   38,388    
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 316,094 316,094   $ 302,192
Fair Value, principal amount, loans held for sale $ 330,501 330,501 $ 297,896  
Fair value, option, changes in fair value, gain (loss)   $ (14,407) $ 4,296