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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($) state brand $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) state brand $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) shares	Jan. 01, 2019 USD ($)	Dec. 31, 2015 shares
Debt Instrument [Line Items]
Number of quality brands in portfolio | brand	6		6
Number of states in which entity operates | state	10		10
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock issued and outstanding - historical (shares) | shares	141,661,713	151,162,999	141,661,713	151,162,999
Common stock outstanding (shares) | shares	141,661,713	151,162,999	141,661,713	151,162,999
Impairment charges			$ 0	$ 854,000	$ 0
Impairment of investments in unconsolidated entities			0	13,200,000	0
Gross unrecognized tax benefits	$ 1,014,000	$ 1,521,000	1,014,000	1,521,000	$ 0
Reduction in deferred tax asset		$ 22,000,000	$ (740,000)	$ 22,000,000
Common Stock [Member]
Debt Instrument [Line Items]
Common stock outstanding (shares) | shares	141,661,713	151,162,999	141,661,713	151,162,999	158,626,229		161,813,750
Dallas-based homebuilder [Member]
Debt Instrument [Line Items]
Cash payment to acquire homebuilder	$ 61,500,000
ASU 2016-02 [Member] | Expected impact [Member]
Debt Instrument [Line Items]
Expected increase in lease asset						$ 58,000,000
Expected increase in lease liability						$ 57,000,000

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