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Results of Quarterly Operations - Schedule of Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 1,132,697 $ 775,071 $ 771,303 $ 583,676 $ 1,128,520 $ 717,735 $ 570,626 $ 393,391 $ 3,262,747 $ 2,810,272 $ 2,405,142
Cost of homes sales and other 897,913 609,877 606,111 451,607 880,849 534,494 455,476 319,618      
Gross margin 234,784 165,194 165,192 132,069 247,671 183,241 115,150 73,773      
Net income 100,984 63,969 63,680 42,880 74,242 72,289 32,803 8,217 271,513 187,551 196,133
Net income attributable to noncontrolling interests (1,602) 0 0 0 (222) (25) (89) (24) (1,602) (360) (962)
Net income available to common stockholders $ 99,382 $ 63,969 $ 63,680 $ 42,880 $ 74,020 $ 72,264 $ 32,714 $ 8,193 $ 269,911 $ 187,191 $ 195,171
Earnings per share                      
Basic (in dollars per share) $ 0.70 $ 0.43 $ 0.42 $ 0.28 $ 0.49 $ 0.48 $ 0.21 $ 0.05 $ 1.82 $ 1.21 $ 1.21
Diluted (in dollars per share) $ 0.70 $ 0.43 $ 0.42 $ 0.28 $ 0.49 $ 0.48 $ 0.21 $ 0.05 $ 1.81 $ 1.21 $ 1.21