Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Aug. 16, 2021
Document Information [Line Items]
Entity Registrant Name	Altimeter Growth Corp.
Entity Central Index Key	0001823340
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Document Quarterly Report	true
Amendment Flag	false
Document Transition Report	false
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Address, State or Province	CA
Entity File Number	001-39573
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	true
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	2550 Sand Hill Road, Suite 150
Entity Address, City or Town	Menlo Park
Entity Tax Identification Number	98-1554598
Entity Address, Postal Zip Code	94025
City Area Code	650
Local Phone Number	549-9145
Class A Ordinary Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		50,000,000
Security Exchange Name	NASDAQ
Trading Symbol	AGC
Title of 12(b) Security	Class A ordinary shares included as part of the units
Class B Ordinary Shares [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		12,500,000
Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-fifth of one redeemable warrant
Document Information [Line Items]
Security Exchange Name	NASDAQ
Trading Symbol	AGCUU
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-fifth of one redeemable warrant
Redeemable warrants, each whole warrant exercisable
Document Information [Line Items]
Security Exchange Name	NASDAQ
Trading Symbol	AGCWW
Title of 12(b) Security	Redeemable warrants included as part of the units, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50