Earnings Per Share - Summary of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income (loss) attributable to AppLovin	$ 108,639	$ 80,357	$ (4,518)	$ 23,771	$ (21,748)	$ (115,257)	$ 184,478	$ (113,234)
Income attributable to options exercises by promissory notes	(442)			(102)			(720)	0
Income attributable to common stock subject to share repurchase agreements	(360)			0			(228)	0
Income attributable to unvested early exercised options	(2)			(18)			(15)	0
Income attributable to unvested RSAs	0			(2)			0	0
Net income (loss) attributable to AppLovin common stockholders—Basic	$ 107,835			$ 23,649			$ 183,515	$ (113,234)
Denominator:
Weighted-average shares used in computing net income (loss) per share—Basic (in shares)	341,435,759			369,389,170			357,009,609	371,736,763
Net income (loss) per share attributable to common stock—Basic (in dollars per share)	$ 0.32			$ 0.06			$ 0.51	$ (0.30)
Numerator:
Net income (loss) attributable to AppLovin	$ 108,639	$ 80,357	$ (4,518)	$ 23,771	$ (21,748)	$ (115,257)	$ 184,478	$ (113,234)
Income attributable to options exercises by promissory notes	(423)			(99)			(698)	0
Income attributable to common stock subject to share repurchase agreements	(345)			0			(220)	0
Income attributable to unvested early exercised options	(2)			(17)			(15)	0
Income attributable to unvested RSAs	0			(2)			0	0
Net income (loss) attributable to AppLovin common stockholders—Diluted	$ 107,869			$ 23,653			$ 183,545	$ (113,234)
Denominator:
Weighted-average shares used in computing net income (loss) per share—Basic (in shares)	341,435,759			369,389,170			357,009,609	371,736,763
Weighted-average dilutive stock awards (in shares)	15,470,463			9,073,037			11,249,904	0
Weighted-average shares used in computing net income (loss) per share—Diluted (in shares)	356,906,222			378,462,207			368,259,513	371,736,763
Net income (loss) per share attributable to AppLovin common stockholders—Diluted (in dollars per share)	$ 0.30			$ 0.06			$ 0.50	$ (0.30)