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Loss Per Share - Summary of Earnings Per Share Basic and Diluted (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥) ¥ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 CNY (¥) ¥ / shares shares	Dec. 31, 2020 $ / shares	Dec. 31, 2019 CNY (¥) ¥ / shares shares
Numerator:
Net loss attributable to Kingsoft Cloud Holdings Limited	¥ (1,588,712)	$ (249,303)	¥ (962,259)		¥ (1,111,199)
Accretion to redemption value of redeemable convertible preferred shares	0	0	(19,768)		(49,725)
Net loss attributable to ordinary shareholders	¥ (1,588,712)	$ (249,303)	¥ (982,027)		¥ (1,160,924)
Denominator:
Weighted average number of ordinary shares outstanding - basic and diluted	3,441,729,444	3,441,729,444	2,400,874,197		889,521,200
Basic and diluted loss per share | (per share)	¥ (0.46)	$ (0.07)	¥ (0.41)	$ (0.41)	¥ (1.31)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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