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Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount $ 202,159 $ 145,423
Finite-lived intangible assets, Accumulated Amortization (38,206) (24,456)
Finite-lived intangible assets, Net Carrying Value 163,953 120,967
Customer Relationships [Member]    
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount 196,806 144,123
Finite-lived intangible assets, Accumulated Amortization (36,765) (23,517)
Finite-lived intangible assets, Net Carrying Value $ 160,041 $ 120,606
Customer Relationships [Member] | Minimum [Member]    
Other Intangible Assets [Line Items]    
Intangible assets estimated useful life 5 years 5 years
Customer Relationships [Member] | Maximum [Member]    
Other Intangible Assets [Line Items]    
Intangible assets estimated useful life 15 years 15 years
Agent Relationships [Member]    
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount $ 2,432  
Finite-lived intangible assets, Accumulated Amortization (51)  
Finite-lived intangible assets, Net Carrying Value $ 2,381  
Intangible assets estimated useful life 4 years  
Trade Name [Member]    
Other Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross Amount $ 2,921 $ 1,300
Finite-lived intangible assets, Accumulated Amortization (1,390) (939)
Finite-lived intangible assets, Net Carrying Value $ 1,531 $ 361
Intangible assets estimated useful life 18 months 18 months