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Revenue from Contracts with Customers - Summary of Disaggregation of Revenues from Contracts (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues from contracts with customers |  | $ 487,325 | $ 484,781 | $ 467,815 | $ 459,923 | $ 442,942 | $ 427,300 | $ 413,696 | $ 405,164 | $ 1,899,843 | $ 1,689,102 | $ 1,519,084
Term Life Insurance Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues from contracts with customers |  |  |  |  |  |  |  |  |  | 1,123,200 | 992,224 | 866,382
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 |  |  |  |  |  |  |  |  |  | 42,374 | 41,236 | 36,541
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 |  |  |  |  |  |  |  |  |  | 42,374 | 41,236 | 36,541
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 |  |  |  |  |  |  |  |  |  | 1,080,826 | 950,988 | 829,841
Investment and Savings Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues from contracts with customers |  |  |  |  |  |  |  |  |  | 655,076 | 572,747 | 524,621
Investment and Savings Products Segment [Member] | Total Segment Revenues from Contracts with Customers [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues from contracts with customers |  |  |  |  |  |  |  |  |  | 596,719 | 514,117 | 470,326
Investment and Savings Products 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 |  |  |  |  |  |  |  |  |  | 9,631 | 9,555 | 8,836
Investment and Savings Products 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 |  |  |  |  |  |  |  |  |  | 259,991 | 233,005 | 227,320
Investment and Savings Products 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 |  |  |  |  |  |  |  |  |  | 245,295 | 216,527 | 183,309
Investment and Savings Products 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 |  |  |  |  |  |  |  |  |  | 81,802 | 55,030 | 50,861
Investment and Savings Products 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 |  |  |  |  |  |  |  |  |  | 58,357 | 58,630 | 54,295
Corporate and Other Distributed Products Segment Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of revenues from contracts with customers |  |  |  |  |  |  |  |  |  | 121,567 | 124,131 | 128,081
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 |  |  |  |  |  |  |  |  |  | 37,144 | 33,425 | 31,100
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 |  |  |  |  |  |  |  |  |  | 4,982 | 5,300 | 5,199
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 | [1] |  |  |  |  |  |  |  |  | 32,162 | 28,125 | 25,901
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 |  |  |  |  |  |  |  |  |  | $ 84,423 | $ 90,706 | $ 96,981
[1] | Commissions and fees for the year ended December 31, 2018 include $5.4 million, attributable to performance obligations satisfied in a previous reporting period and represent the collection of variable consideration in the transaction price that had been previously constrained.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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