Results of Quarterly Operations (Unaudited) - Schedule of Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 1,141,274	$ 748,395	$ 698,714	$ 494,632	$ 1,132,697	$ 775,071	$ 771,303	$ 583,676	$ 3,083,015	$ 3,262,747	$ 2,810,272
Cost of homes sales and other	889,628	578,731	580,873	423,621	897,913	609,877	606,111	451,607
Gross margin	251,646	169,664	117,841	71,011	234,784	165,194	165,192	132,069
Net income	117,993	62,861	26,262	71	100,984	63,969	63,680	42,880	207,187	271,513	187,551
Net income attributable to noncontrolling interests	0	0	0	0	(1,602)	0	0	0	0	(1,602)	(360)
Net income available to common stockholders	$ 117,993	$ 62,861	$ 26,262	$ 71	$ 99,382	$ 63,969	$ 63,680	$ 42,880	$ 207,187	$ 269,911	$ 187,191
Earnings per share
Basic (in dollars per share)	$ 0.85	$ 0.45	$ 0.18	$ 0	$ 0.70	$ 0.43	$ 0.42	$ 0.28	$ 1.47	$ 1.82	$ 1.21
Diluted (in dollars per share)	$ 0.85	$ 0.44	$ 0.18	$ 0	$ 0.70	$ 0.43	$ 0.42	$ 0.28	$ 1.47	$ 1.81	$ 1.21