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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total fair value measurement gain/(loss) $ 3,390   $ 14,111
Home Building [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior Notes carrying value 598,456   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 598,456   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 610,500   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 430,942   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) (10,721) $ 8,909  
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 972,380    
Total fair value measurement gain/(loss) 19,030    
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 1,293,045    
Total fair value measurement gain/(loss) (27,097)    
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 430,942   492,125
Fair Value, Option, Changes in Fair Value, Gain (Loss) 11,457   7,019
Fair Value, Principal Amount, Loans Held for Sale $ 419,485   $ 485,106