Income Taxes - Summary of Combined Activity and Taxable Activity (Detail) - TRS [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Before Income Taxes [Line Items]
Book (loss) income before income taxes	$ (240)	$ 7,258	$ 1,872
Current	39	34	(430)
Deferred	0	0	0
Total income tax expense (benefit)	$ 39	$ 34	$ (430)