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Organization and Significant Accounting Policies - Earnings Per Share Basic And Diluted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share, Basic and Diluted [Abstract]      
Net loss attributable to stockholders of Advantage Solutions, Inc. $ (162,443) $ (21,172) $ (1,157,332)
Weighted-average number of common shares 223,227,833 203,750,000 203,750,000
Basic and diluted net loss per common share $ (0.73) $ (0.10) $ (5.68)