v3.25.2
Revenue from Contracts with Customers - Summary of Disaggregation of Revenues from Contracts (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers $ 793,334 $ 790,955 $ 1,598,177 $ 1,526,904
Term Life Insurance Segment [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 441,834 426,944 899,676 867,357
Term Life Insurance Segment [Member] | Total Segment Revenues from Contracts with Customers [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 12,221 12,624 24,966 25,274
Term Life Insurance Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 12,221 12,624 24,966 25,274
Term Life Insurance Segment [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 429,613 414,320 874,710 842,083
Investment and Savings Product Segment [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 298,298 260,906 589,109 504,622
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 285,374 247,552 563,301 477,435
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 3,236 3,224 6,568 6,482
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Sales-based Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 115,933 101,177 227,204 189,924
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Asset-based Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 141,811 119,411 280,941 234,110
Investment and Savings Product Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member] | Account-based Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 24,394 23,740 48,588 46,919
Investment and Savings Product Segment [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 12,924 13,354 25,808 27,187
Corporate and Other Distributed Products Segment Revenues [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 53,202 103,105 109,392 154,925
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 11,907 11,275 22,443 20,465
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Other, Net [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 937 764 1,996 1,467
Corporate and Other Distributed Products Segment Revenues [Member] | Total Segment Revenues from Contracts with Customers [Member] | Commissions and Fees [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers 10,970 10,511 20,447 18,998
Corporate and Other Distributed Products Segment Revenues [Member] | Revenues from Sources Other Than Contracts with Customers (Segregated Funds) [Member]        
Disaggregation Of Revenue [Line Items]        
Disaggregation of revenues from contracts with customers $ 41,295 $ 91,830 $ 86,949 $ 134,460