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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, 2017 USD ($) Settlements Backlog order $ / shares | Sep. 30, 2017 USD ($) Settlements Backlog order $ / shares | Jun. 30, 2017 USD ($) Settlements Backlog order $ / shares | Mar. 31, 2017 USD ($) Settlements Backlog order $ / shares | Dec. 31, 2016 USD ($) Settlements Backlog order $ / shares | Sep. 30, 2016 USD ($) Settlements Backlog order $ / shares | Jun. 30, 2016 USD ($) Settlements Backlog order $ / shares | Mar. 31, 2016 USD ($) Settlements Backlog order $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 124,619 | $ 162,102 | $ 147,877 | $ 102,923 | $ 150,891 | $ 117,392 | $ 91,676 | $ 65,303 | $ 537,521 | $ 425,262 | $ 382,927
Diluted earnings per share (USD per share) | $ / shares | $ 28.88 | $ 38.02 | $ 35.19 | $ 25.12 | $ 37.80 | $ 28.46 | $ 22.01 | $ 15.79 | $ 126.77 | $ 103.61 | $ 89.99
New orders (units) | order | 4,306 | 4,200 | 4,678 | 4,424 | 3,645 | 3,477 | 4,324 | 4,137 |  |  |
Settlements (units) | Settlements | 4,630 | 4,158 | 3,917 | 3,256 | 4,419 | 3,922 | 3,581 | 3,006 |  |  |
Backlog, end of period (units) | Backlog | 8,531 | 8,855 | 8,813 | 8,052 | 6,884 | 7,658 | 8,103 | 7,360 |  |  |
Loans closed | $ 1,229,695 | $ 1,115,494 | $ 1,041,613 | $ 843,341 | $ 1,201,164 | $ 1,055,163 | $ 942,407 | $ 753,840 |  |  |
Homebuilding: |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues – homebuilding operations | 1,781,494 | 1,633,726 | 1,512,714 | 1,247,587 | 1,718,527 | 1,507,451 | 1,361,741 | 1,121,504 | $ 6,175,521 | $ 5,709,223 | $ 5,065,200
Gross profit – homebuilding operations | 343,187 | 325,755 | 294,631 | 221,570 | 305,087 | 265,159 | 235,372 | 195,744 |  |  |
Mortgage Banking: |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Mortgage banking fees | $ 34,842 | $ 34,194 | $ 31,778 | $ 29,505 | $ 34,239 | $ 30,118 | $ 26,442 | $ 22,522 | $ 130,319 | $ 113,321 | $ 93,808

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