Income Taxes - Sources of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax liabilities:
Fixed assets	$ (30,499)	$ (27,374)
Operating and Finance lease right-of-use assets	(6,016)	(2,223)
Other	(61)	(72)
State deferred taxes	(3,842)	(3,210)
Total deferred tax liabilities	(40,418)	(32,879)
Deferred tax assets:
Captive insurance subsidiary	396	378
Accrued liabilities	2,383	2,325
Stock compensation	3,076	2,635
Operating and Finance lease liabilities	7,936	2,232
SmartStop TRS	0	219
Other	916	1,554
State deferred taxes	6,548	6,725
Total deferred tax assets	21,255	16,068
Valuation allowance	(2,241)	(3,302)
Net deferred income tax liabilities	$ (21,404)	$ (20,113)