Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain From Loan Sale	$ 3,256
Interest Rate Movement Effect	(1,362)
Servicing Rights Value	16,561
Security Price Change	(218)
Total Fair Value Measurement Gain/(Loss)	18,237	$ 15,583
Senior Notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	599,553	598,925
Senior Notes Due Two Thousand Thirty [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	916,702	918,470
Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	1,516,255	1,517,395
Level 2 | Fair Value, Measurements, Recurring | Senior Notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes fair value	610,452	630,000
Level 2 | Fair Value, Measurements, Recurring | Senior Notes Due Two Thousand Thirty [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes fair value	942,192	982,620
Level 2 | Fair Value, Measurements, Recurring | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes fair value	1,552,644	1,612,620
Home Building
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	1,516,255	1,517,395
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain From Loan Sale	2,583
Interest Rate Movement Effect	(496)
Servicing Rights Value	12,072
Security Price Change	0
Total Fair Value Measurement Gain/(Loss)	14,159
Derivative, Notional Amount	1,028,451
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain From Loan Sale	0
Interest Rate Movement Effect	0
Servicing Rights Value	0
Security Price Change	(218)
Total Fair Value Measurement Gain/(Loss)	(218)
Derivative, Notional Amount	1,184,999
Mortgage Banking | Level 2 | Fair Value, Measurements, Recurring | Mortgages held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assumed Gain From Loan Sale	673
Interest Rate Movement Effect	(866)
Servicing Rights Value	4,489
Security Price Change	0
Total Fair Value Measurement Gain/(Loss)	4,296	10,042
Derivative, Notional Amount	$ 297,896	$ 439,718