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Acquisitions - Schedule of Supplemental Information on an Unaudited Pro Forma Basis (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Combinations [Abstract] |  |  |
Total revenues | $ 3,181,224 | $ 3,869,643 | $ 3,772,569
Net loss attributable to stockholders of Advantage Solutions Inc. | $ (156,145) | $ (12,696) | $ (1,152,738)
Basic and diluted net loss per common share | $ (0.70) | $ (0.06) | $ (5.66)

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