Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets, Net - Summary of Intangible Assets (Detail)

v3.21.2
Intangible Assets, Net - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Indefinite-lived Intangible Assets [Line Items]    
Total non-amortizing intangibles $ 178,000 $ 5,422
Amortizing intangibles, Cost 541,590 23,681
Accumulated Amortization (26,914) (12,172)
Amortizing intangibles, Net 514,676 11,509
Total intangibles, Cost 719,590 29,103
Total intangibles, Net 692,676 16,931
Customer Lists [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortizing intangibles, Cost   12,754
Accumulated Amortization   (5,100)
Amortizing intangibles, Net   $ 7,654
Customer Lists [Member] | Maximum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years)   12 years
Customer Lists [Member] | Minimum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years)   5 years
Broker/customer relationships [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years)   10 years
Amortizing intangibles, Cost 530,900 $ 7,627
Accumulated Amortization (26,474) (5,429)
Amortizing intangibles, Net $ 504,426 2,198
Broker/customer relationships [Member] | Maximum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years) 15 years  
Broker/customer relationships [Member] | Minimum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years) 8 years  
Trade names [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortizing intangibles, Cost   2,495
Accumulated Amortization   (1,487)
Amortizing intangibles, Net   $ 1,008
Trade names [Member] | Maximum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years)   20 years
Trade names [Member] | Minimum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years)   5 years
Technology assets [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years)   5 years
Amortizing intangibles, Cost   $ 805
Accumulated Amortization   (156)
Amortizing intangibles, Net   649
Trade names and other [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortizing intangibles, Cost $ 10,690  
Accumulated Amortization (440)  
Amortizing intangibles, Net $ 10,250  
Trade names and other [Member] | Maximum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years) 10 years  
Trade names and other [Member] | Minimum [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Amortization Period (Years) 5 years  
Trade names [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Total non-amortizing intangibles $ 178,000 $ 5,422