Financial Services - Summary of Financial Services, Net (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Subsidiary or Equity Method Investee [Line Items]
Operating revenue	$ 465,469,000	$ 519,452,000	$ 921,333,000	$ 892,820,000
Cost of sales	(446,801,000)	(485,284,000)	(884,561,000)	(844,217,000)
Operating income (loss)	18,668,000	34,168,000	36,772,000	48,603,000
Transaction expenses	0	(777,000)	0	(3,907,000)
Equity in income of unconsolidated joint ventures	1,378,000	533,000	2,290,000	1,465,000
Total Financial Services (loss) income	(834,000)	533,000	78,000	1,465,000
ClosingMark Financial Group, LLC
Subsidiary or Equity Method Investee [Line Items]
Operating revenue	4,645,000	0	4,645,000	0
Cost of sales	(5,867,000)	0	(5,867,000)	0
Operating income (loss)	(1,222,000)	0	(1,222,000)	0
Transaction expenses	(990,000)	0	(990,000)	0
Equity in income of unconsolidated joint ventures	1,378,000	533,000	2,290,000	1,465,000
Total Financial Services (loss) income	(834,000)	533,000	78,000	1,465,000
ClosingMark Financial Group, LLC | Title & Escrow
Subsidiary or Equity Method Investee [Line Items]
Operating revenue	372,000	0	372,000	0
Cost of sales	(439,000)	0	(439,000)	0
ClosingMark Financial Group, LLC | Mortgage
Subsidiary or Equity Method Investee [Line Items]
Operating revenue	4,273,000	0	4,273,000	0
Cost of sales	(5,066,000)	0	(5,066,000)	0
ClosingMark Financial Group, LLC | Administrative
Subsidiary or Equity Method Investee [Line Items]
Cost of sales	$ (362,000)	$ 0	$ (362,000)	$ 0