Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense Benefit [Line Items]
Other	$ (549)	$ (1,020)	$ (17,242)
TRS [Member]
Income Tax Expense Benefit [Line Items]
Statutory Rate	21.00%	21.00%	21.00%
Statutory rate applied to pre-tax income	$ (50)	$ 1,524	$ 393
State tax expense net of federal income tax	33	27	0
AMT benefit refund	0	0	(430)
Deferred tax impact of contributions of assets	(3,617)	0	0
Deferred tax impact of tax rate change	(300)	(89)	7,350
Valuation allowance decrease (increase) based on impact of tax rate change	300	89	(7,350)
Valuation allowance increase (decrease) – other deferred	3,854	(1,608)	(672)
Other	(181)	91	279
Total expense (benefit)	$ 39	$ 34	$ (430)
Effective tax rate	(16.20%)	0.47%	(22.97%)