Fair Value Measurements - Changes in Fair Value of Warrant Liabilities (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Warrant Liabilities [Roll Forward]
Warrant liability, beginning of period	$ 2,999,250	$ 8,546,250	$ 14,745,000		$ 14,745,000
Change in fair value	(182,212)	(5,547,000)	(6,198,750)	$ (6,779,562)	(11,927,962)	$ (15,999,574)
Warrant liability, end of period	2,817,038	2,999,250	8,546,250		2,817,038
Recurring
Warrant Liabilities [Roll Forward]
Warrant liability, beginning of period	2,999,250	8,546,250	14,745,000		14,745,000
Change in fair value	(182,212)	(5,547,000)	(6,198,750)
Warrant liability, end of period	2,817,038	2,999,250	8,546,250		2,817,038
Private Placement Warrants \| Recurring
Warrant Liabilities [Roll Forward]
Warrant liability, beginning of period	1,488,000	4,240,000	7,920,000		7,920,000
Change in fair value	(90,400)	(2,752,000)	(3,680,000)
Warrant liability, end of period	1,397,600	1,488,000	4,240,000		1,397,600
Public Warrants \| Recurring
Warrant Liabilities [Roll Forward]
Warrant liability, beginning of period	1,511,250	4,306,250	6,825,000		6,825,000
Change in fair value	(91,812)	(2,795,000)	(2,518,750)
Warrant liability, end of period	$ 1,419,438	$ 1,511,250	$ 4,306,250		$ 1,419,438

Fortress Value Acquisition Corp. IV 10-Q