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Net Loss per Share - Schedule of Earnings Per Share (Detail) - 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 loss $ (137,104) $ (93,515) $ (398,509) $ (70,575) $ (69,652) $ (70,253) $ (629,128) $ (210,480)
Net loss attributable to non-controlling interest (690)     (491)     (2,551) (1,214)
Net loss attributable to American Well Corporation $ (136,414)     $ (70,084)     $ (626,577) $ (209,266)
Denominator:                
Weighted-average common shares outstanding, basic 285,900,811     277,389,730     282,982,875 272,846,985
Weighted-average common shares outstanding, diluted 285,900,811     277,389,730     282,982,875 272,846,985
Net loss per share attributable to common stockholders, basic $ (0.48)     $ (0.25)     $ (2.21) $ (0.77)
Net loss per share attributable to common stockholders, diluted $ (0.48)     $ (0.25)     $ (2.21) $ (0.77)