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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total fair value measurement gain/(loss)     $ 14,052   $ 15,583
Home Building Segment          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes carrying value $ 1,516,544   1,516,544   1,517,395
Home Building Segment | Senior Notes due 2022          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes carrying value 599,396   599,396   598,925
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 917,148   917,148   918,470
Home Building Segment | Senior Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes carrying value 1,516,544   1,516,544   1,517,395
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 614,568   614,568   630,000
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 941,697   941,697   982,620
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 1,556,265   1,556,265   1,612,620
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) (3,771) $ 1,735 (1,531) $ 1,968  
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 961,557   961,557    
Total fair value measurement gain/(loss)     7,962    
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 1,107,575   1,107,575    
Total fair value measurement gain/(loss)     3,403    
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 287,525   287,525   449,760
Fair Value, principal amount, loans held for sale $ 284,838   284,838   439,718
Fair value, option, changes in fair value, gain (loss)     $ 2,687   $ 10,042