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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total fair value measurement gain/(loss) $ 28,346   $ 18,237
Home Building Segment      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes carrying value 1,515,964   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 599,711   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 916,253   916,702
Home Building Segment | Senior Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes carrying value 1,515,964   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 600,900   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 842,904   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 1,443,804   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) 10,109 $ 548  
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 2,146,716    
Total fair value measurement gain/(loss) (4,691)    
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 2,301,443    
Total fair value measurement gain/(loss) 38,996    
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 312,726   $ 302,192
Fair Value, principal amount, loans held for sale 318,685 297,896  
Fair value, option, changes in fair value, gain (loss) $ (5,959) $ 4,296