SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail)			3 Months Ended
	Jan. 01, 2019 USD ($)	Jan. 17, 2018 shares	Mar. 31, 2019 USD ($) lot shares	Mar. 31, 2018 USD ($) shares	Dec. 31, 2018 USD ($) lot
Class of Stock [Line Items]
Operating lease right of use assets	$ 27,384,000		$ 29,378,000	$ 0	$ 0
Beginning Operating lease right of use liabilities due to adoption of ASU 2016-02			$ (30,331,000)	$ 0
Repurchase of common stock (in shares) | shares			4,376,879	3,838,771
Impairment of real estate inventory			$ 0
Number of inactive projects | lot			43,637		43,664
Prepaid expenses and other assets, net			$ 94,459,000		$ 98,225,000
Property and equipment, net			85,275,000		86,736,000
Retained earnings			$ 578,829,000		$ 527,698,000
Operating lease expense	$ 2,065,000			$ 0
Class A Common Stock
Class of Stock [Line Items]
Repurchase of common stock (in shares) | shares		7,600,000