Percentage of fixed maturities by component at fair value.

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Investments - Summary of Fixed Maturities Available for Sale by Component (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 17,181,967		$ 21,305,287
Fixed maturities available for sale
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,996,386		17,805,309
Allowance for Credit Losses	0		(387)
Gross Unrealized Gains	545,051		3,534,404
Gross Unrealized Losses	(1,359,470)		(34,039)
Fair Value	$ 17,181,967		$ 21,305,287
Percentage of Fixed Maturities at Fair Value	100.00%		100.00%
Fixed maturities available for sale \| U.S. Government direct, guaranteed, and government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 386,907		$ 383,083
Allowance for Credit Losses	0		0
Gross Unrealized Gains	875		64,513
Gross Unrealized Losses	(8,438)		(164)
Fair Value	$ 379,344		$ 447,432
Percentage of Fixed Maturities at Fair Value	2.00%		2.00%
Fixed maturities available for sale \| States, municipalities, and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,614,124		$ 2,252,997
Allowance for Credit Losses	0		0
Gross Unrealized Gains	54,087		239,135
Gross Unrealized Losses	(388,631)		(2,907)
Fair Value	$ 2,279,580		$ 2,489,225
Percentage of Fixed Maturities at Fair Value	13.00%		12.00%
Fixed maturities available for sale \| Foreign governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 55,302		$ 59,861
Allowance for Credit Losses	0		0
Gross Unrealized Gains	144		900
Gross Unrealized Losses	(9,683)		(5,132)
Fair Value	$ 45,763		$ 55,629
Percentage of Fixed Maturities at Fair Value	0.00%		0.00%
Fixed maturities available for sale \| Corporates
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 14,813,708		$ 14,967,902
Allowance for Credit Losses	0	$ 0	(387)	$ 0	$ 0	$ (3,346)
Gross Unrealized Gains	473,997		3,199,104
Gross Unrealized Losses	(950,288)		(25,406)
Fair Value	$ 14,337,417		$ 18,141,213
Percentage of Fixed Maturities at Fair Value	84.00%		85.00%
Fixed maturities available for sale \| Corporates \| Financial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,639,902		$ 4,569,160
Allowance for Credit Losses	0		(387)
Gross Unrealized Gains	147,936		907,741
Gross Unrealized Losses	(322,283)		(9,349)
Fair Value	$ 4,465,555		$ 5,467,165
Percentage of Fixed Maturities at Fair Value	26.00%		26.00%
Fixed maturities available for sale \| Corporates \| Utilities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,916,537		$ 1,931,391
Allowance for Credit Losses	0		0
Gross Unrealized Gains	102,727		490,119
Gross Unrealized Losses	(69,418)		(1,012)
Fair Value	$ 1,949,846		$ 2,420,498
Percentage of Fixed Maturities at Fair Value	11.00%		11.00%
Fixed maturities available for sale \| Corporates \| Energy
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,497,600		$ 1,587,892
Allowance for Credit Losses	0		0
Gross Unrealized Gains	53,410		346,780
Gross Unrealized Losses	(74,477)		(1,683)
Fair Value	$ 1,476,533		$ 1,932,989
Percentage of Fixed Maturities at Fair Value	9.00%		9.00%
Fixed maturities available for sale \| Corporates \| Other corporate sectors
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 6,759,669		$ 6,879,459
Allowance for Credit Losses	0		0
Gross Unrealized Gains	169,924		1,454,464
Gross Unrealized Losses	(484,110)		(13,362)
Fair Value	$ 6,445,483		$ 8,320,561
Percentage of Fixed Maturities at Fair Value	38.00%		39.00%
Fixed maturities available for sale \| Collateralized debt obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 36,762		$ 36,468
Allowance for Credit Losses	0		0
Gross Unrealized Gains	15,939		27,037
Gross Unrealized Losses	0		0
Fair Value	$ 52,701		$ 63,505
Percentage of Fixed Maturities at Fair Value	0.00%		0.00%
Fixed maturities available for sale \| Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 89,583		$ 104,998
Allowance for Credit Losses	0		0
Gross Unrealized Gains	9		3,715
Gross Unrealized Losses	(2,430)		(430)
Fair Value	$ 87,162		$ 108,283
Percentage of Fixed Maturities at Fair Value	1.00%		1.00%