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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total fair value measurement gain/(loss)     $ 10,408   $ 14,111
Home Building [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes carrying value $ 1,193,962   1,193,962   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 carrying value 598,612   598,612   598,301
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 637,500   637,500   626,520
Mortgage Banking [Member]          
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 325,208   325,208   492,125
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) 7,018 $ 2,644 (3,703) $ 11,553  
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 736,509   736,509    
Total fair value measurement gain/(loss)     8,894    
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 896,225   896,225    
Total fair value measurement gain/(loss)     (4,232)    
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]          
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group 325,208   325,208   492,125
Fair Value, Option, Changes in Fair Value, Gain (Loss)     5,746   7,019
Fair Value, Principal Amount, Loans Held for Sale $ 319,462   $ 319,462   $ 485,106