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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, 2024
Mar. 31, 2023
Numerator:    
Net loss $ (73,449) $ (398,509)
Net loss attributable to non-controlling interest (1,344) (821)
Net loss attributable to American Well Corporation $ (72,105) $ (397,688)
Denominator:    
Weighted-average common shares outstanding, basic 291,833,853 279,966,645
Weighted-average common shares outstanding, diluted 291,833,853 279,966,645
Net loss per share attributable to common stockholders, basic $ (0.25) $ (1.42)
Net loss per share attributable to common stockholders, diluted $ (0.25) $ (1.42)