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Quarterly Results (unaudited) - Quarterly Financial Data and Operating Information (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 USD ($) Contract Settlements Backlog $ / shares | Sep. 30, 2015 USD ($) Contract Settlements Backlog $ / shares | Jun. 30, 2015 USD ($) Contract Settlements Backlog $ / shares | Mar. 31, 2015 USD ($) Contract Settlements Backlog $ / shares | Dec. 31, 2014 USD ($) Contract Settlements Backlog $ / shares | Sep. 30, 2014 USD ($) Contract Settlements Backlog $ / shares | Jun. 30, 2014 USD ($) Contract Settlements Backlog $ / shares | Mar. 31, 2014 USD ($) Contract Settlements Backlog $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares | Dec. 31, 2013 USD ($) $ / shares
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 134,004 | $ 116,470 | $ 93,395 | $ 39,058 | $ 99,451 | $ 90,152 | $ 68,178 | $ 23,849 | $ 382,927 | $ 281,630 | $ 266,477
Diluted earnings per share | $ / shares | $ 31.92 | $ 27.11 | $ 21.91 | $ 9.22 | $ 23.24 | $ 20.70 | $ 15.17 | $ 5.16 | $ 89.99 | $ 63.50 | $ 54.81
Contracts for sale, net of cancellations (units) | Contract | 3,100 | 3,258 | 3,796 | 3,926 | 2,713 | 2,936 | 3,415 | 3,325 |  |  |
Settlements (units) | Settlements | 4,010 | 3,607 | 3,175 | 2,534 | 3,469 | 3,236 | 2,943 | 2,211 |  |  |
Backlog, end of period (units) | Backlog | 6,229 | 7,139 | 7,488 | 6,867 | 5,475 | 6,231 | 6,531 | 6,059 |  |  |
Loans closed | $ 1,042,440 | $ 951,872 | $ 859,403 | $ 638,627 | $ 881,930 | $ 803,125 | $ 675,625 | $ 472,933 |  |  |
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues – homebuilding operations | 1,528,084 | 1,374,467 | 1,221,111 | 941,538 | 1,306,632 | 1,185,160 | 1,084,080 | 799,187 | $ 5,065,200 | $ 4,375,059 | $ 4,134,481
Gross profit – homebuilding operations | 289,496 | 262,795 | 234,257 | 159,870 | 236,031 | 225,105 | 201,302 | 144,035 |  |  |
Mortgage Banking [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage banking fees | $ 27,191 | $ 27,884 | $ 22,522 | $ 16,211 | $ 21,406 | $ 18,006 | $ 17,974 | $ 12,123 | $ 93,808 | $ 69,509 | $ 76,786

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