Non-controlling Interest - Net income reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Minority Interest [Line Items]
Income (loss) before provision for income taxes attributable to Holdings	$ 4,578		$ 3,340		$ 2,132	$ 3,172
Income (loss) before provision for income taxes attributable to NCI	3,085		2,326		1,428	2,207
Income (loss) before provision for income taxes	7,663		5,666		3,560	5,379
(Provision) / benefit for income taxes attributable to Holdings	(873)		(1,330)		(1,780)	(1,833)
(Provision) / benefit for income taxes attributable to NCI	(600)		(1,092)		(1,197)	(981)
(Provision) / benefit for income taxes	(1,473)		(2,422)		(2,977)	(2,814)
Net income (loss) attributable to Holdings	3,705		2,010		352	1,339
Net income (loss) attributable to NCI	2,485		1,234		231	1,226
Net income (loss)	$ 6,190	$ (5,607)	$ 3,244	$ (679)	$ 583	$ 2,565
RMCO, LLC
Minority Interest [Line Items]
WAO percentage	100.00%				100.00%		100.00%
RMCO, LLC | Weighted Average
Minority Interest [Line Items]
WAO percentage of Holdings	60.00%		59.10%		59.80%	58.90%
WAO percentage	100.00%		100.00%		100.00%	100.00%
RIHI | RMCO, LLC | Weighted Average
Minority Interest [Line Items]
WAO percentage: NCI	40.00%		40.90%		40.20%	41.10%