SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail)				1 Months Ended	3 Months Ended			6 Months Ended
	Jan. 17, 2018 shares	Jan. 17, 2018 shares	Jan. 08, 2018 shares	Jan. 31, 2018 shares	Jun. 30, 2018 USD ($) project lot shares	Mar. 31, 2018 shares	Jun. 30, 2017 USD ($) shares	Jun. 30, 2018 USD ($) project lot	Jun. 30, 2017 USD ($) shares	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($) project lot
Class of Stock [Line Items]
Repurchase of common stock (in shares) | shares					0		0		0
Impairment of real estate inventory					$ 0		$ 0	$ 0	$ 0
Number of inactive projects | lot					26,589			26,589			25,921
Equity method investment impairment charges					$ 0		$ 0	$ 0	$ 0
Prepaid expenses and other assets, net					52,029,000			52,029,000			$ 72,334,000
Property and equipment, net					38,916,000			38,916,000			7,112,000
Retained earnings					$ 425,238,000			$ 425,238,000			$ 319,833,000
Class A Common Stock
Class of Stock [Line Items]
Number of shares | shares						28,700,000
Class B Common Stock
Class of Stock [Line Items]
Repurchase of common stock (in shares) | shares	7,600,000	3,800,000	3,800,000	7,600,000
Western Region
Class of Stock [Line Items]
Number of inactive projects | project					1			1			2
Carrying value of community					$ 3,200,000			$ 3,200,000			$ 10,700,000
Central Region
Class of Stock [Line Items]
Number of inactive projects | project					0			0			0
Eastern Region
Class of Stock [Line Items]
Number of inactive projects | project					0			0			0
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Class of Stock [Line Items]
Prepaid expenses and other assets, net										$ (32,000,000)
Property and equipment, net										32,000,000
Retained earnings										$ 2,000,000