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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
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)