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Commitments and Contingencies - Additional Information (Detail)			12 Months Ended
	Feb. 04, 2019 USD ($)	Jan. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 1987 lease_renewal lease_extension lease
Commitment And Contingencies [Line Items]
Legal reserve			$ 17,500,000	$ 0
Increase in warrant liability			(4,286,000)	(9,354,000)	$ 36,826,000
Outstanding warranty insurance receivables			37,597,000	35,817,000
Rental expense			7,800,000	6,900,000	$ 6,400,000
Operating leases future commitments			54,200,000
Operating leases guaranteed future payments			12,500,000
Deposits			71,909,000	27,003,000
Land purchase and land option deposits			71,909,000	27,003,000
Aggregate remaining purchase price			741,200,000
55 year ground lease [Member]
Commitment And Contingencies [Line Items]
Lease term						55 years
Operating leases, renewal term						10 years
Number of properties obtained subject to ground leases | lease						2
Number of lease renewal options | lease_renewal						3
Number of lease extensions exercised | lease_extension						1
45 year ground lease [Member]
Commitment And Contingencies [Line Items]
Lease term						45 years
Number of properties obtained subject to ground leases | lease						1
Surety bonds [Member]
Commitment And Contingencies [Line Items]
Outstanding surety bonds			$ 685,700,000	$ 627,100,000
Property Subject to Operating Lease [Member] | Office Leases [Member]
Commitment And Contingencies [Line Items]
Lease term			10 years
Operating leases, renewal term			5 years
Property Subject to Operating Lease [Member] | Minimum [Member] | Equipment Leases [Member]
Commitment And Contingencies [Line Items]
Lease term			3 years
Property Subject to Operating Lease [Member] | Maximum [Member] | Equipment Leases [Member]
Commitment And Contingencies [Line Items]
Lease term			4 years
Scripps Health v Pardee Homes [Member] | Subsequent Event [Member]
Commitment And Contingencies [Line Items]
Settlement amount agreed on		$ 17,500,000
Payments of settlement amount	$ 17,500,000

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