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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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