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Business Combinations - Pro Forma Information (Details) - Decision Resources Group - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Pro forma revenues, net $ 286,377 $ 1,316,192 $ 828,489
Pro forma net income (loss) attributable to the Company's stockholders(1) $ (180,333)   $ (322,268)