Equity-based Awards - Summary of Information Regarding Restricted Stock Unit Awards (Detail) - Legacy Amplify Management Incentive Plan [Member] - $ / shares		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020
TSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Beginning Balance		115,797		291,370
Granted, Number of Units		1,083,644	[1]	43,250	[2]
Forfeited, Number of Units		(52,601)		(93,845)
Vested, Number of Units		(72,420)		(124,978)
Outstanding, Number of Units, Ending Balance		1,074,420		115,797
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance	[3]	$ 4.47		$ 5.18
Granted, Weighted-Average Grant Date Fair Value per Unit	[3]	3.65	[1]	3.10	[2]
Forfeited, Weighted-Average Grant Date Fair Value per Unit	[3]	3.73		5.12
Vested, Weighted-Average Grant Date Fair Value per Unit	[3]	4.74		5.17
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance	[3]	$ 3.66		$ 4.47
PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding, Number of Units, Beginning Balance		214,554		305,893
Granted, Number of Units		0		43,250	[4]
Forfeited, Number of Units		(148,614)		(134,589)
Vested, Number of Units		0		0
Outstanding, Number of Units, Ending Balance		65,940		214,554
Outstanding, Weighted-Average Grant Date Fair Value per unit, Beginning balance	[3]	$ 2.36		$ 2.15
Granted, Weighted-Average Grant Date Fair Value per Unit	[3]	0		3.03	[4]
Forfeited, Weighted-Average Grant Date Fair Value per Unit	[3]	2.13		2.11
Vested, Weighted-Average Grant Date Fair Value per Unit	[3]	0		0
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance	[3]	$ 2.87		$ 2.36
PRSU [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Number of Units		196,377
Outstanding, Number of Units, Ending Balance		196,377
Granted, Weighted-Average Grant Date Fair Value per Unit		$ 1.94
Outstanding, Weighted-Average Grant Date Fair Value per unit, Ending balance		$ 1.94

[1] The aggregate grant date fair value of TSUs issued for the year ended December 31, 2021 was $4.0 million based on a grant date market price ranging from $3.52 to $4.66 per share.

[2] The aggregate grant date fair value of TSUs issued for the year ended December 31, 2020 was $0.1 million based on a grant date market price ranging from $0.54 to $6.61 per share.

[3] Determined by dividing the aggregate grant date fair value of awards by the number of awards issued.

[4] The aggregate grant date fair value of PSUs issued for the year ended December 31, 2020 was $0.1 million based on a calculated fair value price ranging from $2.46 to $3.66 per share.