REPORTING SEGMENTS - Summary of Assets by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Real estate inventory and land deposits	$ 6,060,249	$ 4,026,354
Investments in unconsolidated entities	127,367	128,759
Other assets	2,074,756	1,090,573
Total assets	8,262,372	5,245,686
Operating Segments | East
Segment Reporting, Asset Reconciling Item [Line Items]
Real estate inventory and land deposits	1,874,786	1,841,904
Investments in unconsolidated entities	0	0
Other assets	162,839	165,777
Total assets	2,037,625	2,007,681
Operating Segments | Central
Segment Reporting, Asset Reconciling Item [Line Items]
Real estate inventory and land deposits	1,337,274	965,039
Investments in unconsolidated entities	37,425	37,506
Other assets	164,505	121,724
Total assets	1,539,204	1,124,269
Operating Segments | West
Segment Reporting, Asset Reconciling Item [Line Items]
Real estate inventory and land deposits	2,847,978	1,219,411
Investments in unconsolidated entities	83,831	86,996
Other assets	541,753	60,060
Total assets	3,473,562	1,366,467
Operating Segments | Financial Services
Segment Reporting, Asset Reconciling Item [Line Items]
Real estate inventory and land deposits	0	0
Investments in unconsolidated entities	(11,335)	4,015
Other assets	278,834	257,760
Total assets	267,499	261,775
Corporate and Unallocated
Segment Reporting, Asset Reconciling Item [Line Items]
Real estate inventory and land deposits	211	0
Investments in unconsolidated entities	17,446	242
Other assets	926,825	485,252
Total assets	$ 944,482	$ 485,494