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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total fair value measurement gain/(loss)     $ 17,151   $ 14,309
Home Building [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Senior Notes carrying value $ 598,146   598,146   597,681
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 598,146   598,146   597,681
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 625,500   625,500   594,000
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 411,223   411,223   458,324
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) (8,711) $ (1,986) 2,842 $ 7,613  
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 827,120   827,120    
Total fair value measurement gain/(loss)     11,468    
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 1,101,965   1,101,965    
Total fair value measurement gain/(loss)     (1,368)    
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 411,223   411,223   458,324
Fair Value, Option, Changes in Fair Value, Gain (Loss)     7,051 $ 10,880  
Fair Value, Principal Amount, Loans Held for Sale $ 404,172   $ 404,172   $ 447,444