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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, 2016 USD ($) Order Settlements Backlog $ / shares | Sep. 30, 2016 USD ($) Order Settlements Backlog $ / shares | Jun. 30, 2016 USD ($) Order Settlements Backlog $ / shares | Mar. 31, 2016 USD ($) Order Settlements Backlog $ / shares | Dec. 31, 2015 USD ($) Order Settlements Backlog $ / shares | Sep. 30, 2015 USD ($) Order Settlements Backlog $ / shares | Jun. 30, 2015 USD ($) Order Settlements Backlog $ / shares | Mar. 31, 2015 USD ($) Order Settlements Backlog $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares | Dec. 31, 2014 USD ($) $ / shares
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 150,891 | $ 117,392 | $ 91,676 | $ 65,303 | $ 134,004 | $ 116,470 | $ 93,395 | $ 39,058 | $ 425,262 | $ 382,927 | $ 281,630
Diluted earnings per share | $ / shares | $ 37.80 | $ 28.46 | $ 22.01 | $ 15.79 | $ 31.92 | $ 27.11 | $ 21.91 | $ 9.22 | $ 103.61 | $ 89.99 | $ 63.50
New orders (units) | Order | 3,645 | 3,477 | 4,324 | 4,137 | 3,100 | 3,258 | 3,796 | 3,926 |  |  |
Settlements (units) | Settlements | 4,419 | 3,922 | 3,581 | 3,006 | 4,010 | 3,607 | 3,175 | 2,534 |  |  |
Backlog, end of period (units) | Backlog | 6,884 | 7,658 | 8,103 | 7,360 | 6,229 | 7,139 | 7,488 | 6,867 |  |  |
Loans closed | $ 1,201,164 | $ 1,055,163 | $ 942,407 | $ 753,840 | $ 1,042,440 | $ 951,872 | $ 859,403 | $ 638,627 |  |  |
Homebuilding [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues – homebuilding operations | 1,718,527 | 1,507,451 | 1,361,741 | 1,121,504 | 1,528,084 | 1,374,467 | 1,221,111 | 941,538 | $ 5,709,223 | $ 5,065,200 | $ 4,375,059
Gross profit – homebuilding operations | 305,087 | 265,159 | 235,372 | 195,744 | 289,496 | 262,795 | 234,257 | 159,870 |  |  |
Mortgage Banking [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage banking fees | $ 34,239 | $ 30,118 | $ 26,442 | $ 22,522 | $ 27,191 | $ 27,884 | $ 22,522 | $ 16,211 | $ 113,321 | $ 93,808 | $ 69,509

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