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Long-Term Debt - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Document Period End Date |  | Sep. 30, 2020 |
Long-term debt including current maturities |  | $ 536,500,000 | $ 486,600,000
Debt Instrument, Unused Borrowing Capacity, Amount |  | 310,000,000 |
NYL Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | $ 40,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.96% |
Prudential Unfunded Commitments [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | $ 50,000,000.0 |
Debt Instrument, Interest Rate, Stated Percentage | [1],[2] | 3.00% |
Uncollateralized Senior Note Due December Two Thousand Thirty Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.98% |
Term Note Due January Two Thousand Twenty [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | $ 70,000,000 | 70,000,000
Term Note Due February Two Thousand Twenty [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 0 | 30,000,000
3.48% note, due May 31, 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 50,000,000 | 50,000,000
3.25% note, due April 30, 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 70,000,000 | $ 70,000,000
New York Life [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 140,000,000 |
Aggregated Unfunded Commitments [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 0 |
Aggregate Shelf Agreements [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 360,000,000 |
MetLife [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | [3] | 150,000,000.0 |
Debt Instrument, Unused Borrowing Capacity, Amount | [3] | 150,000,000 |
Prudential [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt including current maturities |  | 220,000,000 |
Debt Instrument, Unused Borrowing Capacity, Amount | [1],[2] | 150,000,000 |
New York Life [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount | [4] | 10,000,000 |
Maximum [Member] | Aggregate Shelf Agreements [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes |  | 670,000,000 |
Maximum [Member] | Prudential [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | [1],[2] | 370,000,000 |
Maximum [Member] | New York Life [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior notes | [4] | $ 150,000,000 |
[1] | 2) In April 2020, the Prudential Shelf Agreement was amended to increase the available borrowing capacity to $150.0 million. The Shelf Agreement expires in April 2023.
[2] | (1) In January 2020, we requested and Prudential accepted our request to purchase $50.0 million of our unsecured debt. We issued the Shelf Notes in July 2020 at the rate of 3.00 percent per annum.
[3] | (3) In May 2020, we reached into an agreement with MetLife to provide a new $150.0 million MetLife Shelf Agreement for a three-year term ending May 2023.
[4] | (4) In February 2020, we requested and NYL accepted our request to purchase $40.0 million of our unsecured debt. The Shelf Notes were issued in August 2020 at the rate of 2.96 percent per annum. The Shelf Agreement expires in November 2021.

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