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Goodwill, Trade Name, and Customer Lists - Summary of Gross Carrying Value and Accumulated Amortization of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]              
Gross Carrying Value   $ 598,959     $ 598,959 $ 596,440 $ 171,503
Accumulated Amortization   (128,052)     (128,052) (73,077) (105,710)
Net Carrying Value   470,907     470,907 523,363 65,793
Trade Name [Member]              
Finite-Lived Intangible Assets [Line Items]              
Gross Carrying Value   95,171     95,171 95,230 13,224
Accumulated Amortization   (13,480)     (13,480) (7,528)  
Net Carrying Value   81,691     $ 81,691 $ 87,702 13,224
Useful Life (in years)         20 years 20 years  
Customer Lists [Member]              
Finite-Lived Intangible Assets [Line Items]              
Gross Carrying Value   503,788     $ 503,788 $ 501,210 158,279
Accumulated Amortization   (114,572)     (114,572) (65,549) (105,710)
Net Carrying Value   $ 389,216     $ 389,216 $ 435,661 $ 52,569
Useful Life (in years)   14 years 14 years 14 years 14 years 14 years  
Customer Lists [Member] | Minimum              
Finite-Lived Intangible Assets [Line Items]              
Useful Life (in years) 7 years           7 years
Customer Lists [Member] | Maximum              
Finite-Lived Intangible Assets [Line Items]              
Useful Life (in years) 14 years           14 years