Amortized Cost And Estimated Fair Value Of Available-For-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value Measurements Of Financial Instruments [Line Items]
Total available-for-sale debt securities	$ 487,031	$ 519,943
Amortized Cost [Member] \| Homebuilding [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Equity security	183,736	169,565
Debt securities	272,797	323,454
Total available-for-sale debt securities	456,533	493,019
Amortized Cost [Member] \| Financial Services [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Total available-for-sale debt securities	31,888	34,164
Fair Value [Member] \| Homebuilding [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Equity security	178,846	160,021
Debt securities	275,929	325,413
Total available-for-sale debt securities	454,775	485,434
Fair Value [Member] \| Financial Services [Member]
Fair Value Measurements Of Financial Instruments [Line Items]
Total available-for-sale debt securities	$ 32,256	$ 34,509

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

+ References

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