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Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense Benefit [Line Items] |  |  |
Statutory Rate | 21.00% |  |
Other | $ (17,242) | $ (8,409) | $ 2,625
TRS [Member] |  |  |
Income Tax Expense Benefit [Line Items] |  |  |
Statutory Rate | 21.00% | 34.00% | 34.00%
Statutory rate applied to pre-tax income | $ 393 | $ 3,801 | $ 3,384
State tax expense net of federal income tax | 0 | 254 | 498
Deferred tax expense net of federal income tax | 0 | 724 | 0
AMT benefit refund | (430) | 0 | 0
Permanent items | 0 | (241) | 0
Deferred tax impact of tax rate change | 7,350 | 19,391 | 0
Valuation allowance decrease based on impact of tax rate change | (7,350) | (23,470) | (4,039)
Valuation allowance decrease – other deferred | (672) | 0 | 0
Other | 279 | 0 | 174
Total (benefit) expense | $ (430) | $ 459 | $ 17
Effective tax rate | (22.97%) | 4.11% | 0.17%

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