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Quarterly Results - Quarterly Financial Data and Operating Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 Contract Settlements Backlog | Sep. 30, 2012 Settlements Backlog Contract | Jun. 30, 2012 Backlog Contract Settlements | Mar. 31, 2012 Contract Settlements Backlog | Dec. 31, 2011 Backlog Contract Settlements | Sep. 30, 2011 Backlog Settlements Contract | Jun. 30, 2011 Backlog Contract Settlements | Mar. 31, 2011 Backlog Settlements Contract | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage banking fees |  |  |  |  |  |  |  |  | $ 63,406 | $ 47,954 | $ 61,134
Net income | 60,627 | 53,000 | 46,838 | 20,123 | 32,392 | 43,409 | 38,445 | 15,174 | 180,588 | 129,420 | 206,005
Diluted earnings per share | $ 11.98 | $ 10.33 | $ 8.97 | $ 3.90 | $ 6.32 | $ 7.98 | $ 6.48 | $ 2.52 | $ 35.12 | $ 23.01 | $ 33.42
Contracts for sale, net of cancellations (units) | 2,625 | 2,558 | 2,614 | 3,157 | 2,158 | 2,218 | 2,468 | 2,403 |  |  |
Settlements (units) | 2,788 | 2,656 | 2,475 | 1,924 | 2,391 | 2,255 | 2,207 | 1,634 |  |  |
Backlog, end of period (units) | 4,979 | 4,950 | 5,048 | 4,909 | 3,676 | 3,909 | 3,946 | 3,685 |  |  |
Loans closed | 642,171 | 594,867 | 548,871 | 420,184 | 520,919 | 489,866 | 504,116 | 353,571 |  |  |
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | 925,363 | 854,396 | 755,290 | 586,195 | 728,808 | 696,980 | 682,663 | 502,744 | 3,121,244 | 2,611,195 | 2,980,758
Gross profit - homebuilding operations | 168,967 | 151,960 | 130,312 | 94,366 | 112,086 | 124,598 | 124,062 | 84,824 |  |  |
Mortgage Banking [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage banking fees | $ 18,375 | $ 16,241 | $ 14,493 | $ 14,297 | $ 12,480 | $ 10,496 | $ 13,218 | $ 11,760 | $ 63,406 | $ 47,954 | $ 61,134

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