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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
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%