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Net Loss per Share - Schedule of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Numerator:    
Net loss $ (398,509) $ (70,253)
Net loss attributable to non-controlling interest (821) (216)
Net loss attributable to American Well Corporation $ (397,688) $ (70,037)
Denominator:    
Weighted-average common shares outstanding, basic 279,966,645 268,002,110
Weighted-average common shares outstanding, diluted 279,966,645 268,002,110
Net loss per share attributable to common stockholders, basic $ (1.42) $ (0.26)
Net loss per share attributable to common stockholders, diluted $ (1.42) $ (0.26)