General form of registration statement for all companies including face-amount certificate companies

Summary Of Significant Accounting Policies - Summary of intangible assets are amortized on a straight-line basis over their estimated useful lives as follows (Detail)

v3.21.2
Summary Of Significant Accounting Policies - Summary of intangible assets are amortized on a straight-line basis over their estimated useful lives as follows (Detail)
 12 Months Ended
Dec. 31, 2020
Customer relationships [Member] | Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 13 years
Customer relationships [Member] | Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 10 years
Technology [Member] | Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 9 years
Technology [Member] | Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 5 years
Carrier contracts [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 10 years
Trademarks | Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 10 years
Trademarks | Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 9 years
Non-compete agreements  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 3 years
Internally developed and acquired computer software [Member] | Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 5 years
Internally developed and acquired computer software [Member] | Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 3 years