Fair Value of Financial Instruments - Quantitative Disclosures Regarding Fair Value Hierarchy Measurements (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial assets
Fixed maturity securities, bonds available-for-sale	$ 6,480,374	$ 6,725,085
Equity securities	1,375,083	1,700,960
Short-term investments	418,882	425,321
Separate account assets	893,856	1,073,891
Carrying value of bonds held-to-maturity	8,576,192	8,631,261
Fair value of bonds held-to-maturity	8,501,656	8,968,690
Policy loans	380,084	379,657
Total financial assets	27,838,813	28,597,566
Financial liabilities
Separate account liabilities	893,856	1,073,891
Notes payable	156,943	157,997
Total financial liabilities	22,231,724	22,601,803
U.S. treasury and government
Financial assets
Fixed maturity securities, bonds available-for-sale	30,304	29,941
U.S. states and political subdivisions
Financial assets
Fixed maturity securities, bonds available-for-sale	1,078,917	1,078,165
Carrying value of bonds held-to-maturity	155,151	165,109
Fair value of bonds held-to-maturity	159,929	170,114
Foreign governments
Financial assets
Fixed maturity securities, bonds available-for-sale	6,432	6,287
Carrying value of bonds held-to-maturity	3,894	3,907
Fair value of bonds held-to-maturity	4,419	4,349
Corporate debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	5,319,261	5,576,620
Carrying value of bonds held-to-maturity	8,029,559	8,099,098
Fair value of bonds held-to-maturity	7,956,612	8,424,969
Residential mortgage-backed securities
Financial assets
Fixed maturity securities, bonds available-for-sale	29,585	23,943
Carrying value of bonds held-to-maturity	179,087	237,516
Fair value of bonds held-to-maturity	186,919	242,828
Collateralized debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	15,875	10,129
Carrying value of bonds held-to-maturity	208,501	125,631
Fair value of bonds held-to-maturity	193,777	126,430
Recurring
Financial assets
Fixed maturity securities, bonds available-for-sale	6,480,374	6,725,085
Equity securities	1,375,083	1,700,960
Options	125,988	256,005
Short-term investments	418,882	425,321
Separate account assets	871,196	1,049,938
Separately managed accounts	50,583	50,503
Total financial assets	9,322,106	10,207,812
Financial liabilities
Embedded derivative for equity-indexed contracts	630,952	731,552
Separate account liabilities	871,196	1,049,938
Total financial liabilities	1,502,148	1,781,490
Recurring \| Common stock
Financial assets
Equity securities	1,358,605	1,682,149
Recurring \| Preferred stock
Financial assets
Equity securities	16,478	18,811
Recurring \| U.S. treasury and government
Financial assets
Fixed maturity securities, bonds available-for-sale	30,304	29,941
Recurring \| U.S. states and political subdivisions
Financial assets
Fixed maturity securities, bonds available-for-sale	1,078,917	1,078,165
Recurring \| Foreign governments
Financial assets
Fixed maturity securities, bonds available-for-sale	6,432	6,287
Recurring \| Corporate debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	5,319,261	5,576,620
Recurring \| Residential mortgage-backed securities
Financial assets
Fixed maturity securities, bonds available-for-sale	29,585	23,943
Recurring \| Collateralized debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	15,875	10,129
Recurring \| Level 1
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Equity securities	1,374,620	1,700,497
Options	0	0
Short-term investments	0	0
Separate account assets	215,339	271,575
Separately managed accounts	0	0
Total financial assets	1,589,959	1,972,072
Financial liabilities
Embedded derivative for equity-indexed contracts	0	0
Separate account liabilities	215,339	271,575
Total financial liabilities	215,339	271,575
Recurring \| Level 1 \| Common stock
Financial assets
Equity securities	1,358,142	1,681,686
Recurring \| Level 1 \| Preferred stock
Financial assets
Equity securities	16,478	18,811
Recurring \| Level 1 \| U.S. treasury and government
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 1 \| U.S. states and political subdivisions
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 1 \| Foreign governments
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 1 \| Corporate debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 1 \| Residential mortgage-backed securities
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 1 \| Collateralized debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 2
Financial assets
Fixed maturity securities, bonds available-for-sale	6,426,984	6,680,241
Equity securities	0	0
Options	0	0
Short-term investments	418,882	425,321
Separate account assets	655,857	778,363
Separately managed accounts	0	0
Total financial assets	7,501,723	7,883,925
Financial liabilities
Embedded derivative for equity-indexed contracts	0	0
Separate account liabilities	655,857	778,363
Total financial liabilities	655,857	778,363
Recurring \| Level 2 \| Common stock
Financial assets
Equity securities	0	0
Recurring \| Level 2 \| Preferred stock
Financial assets
Equity securities	0	0
Recurring \| Level 2 \| U.S. treasury and government
Financial assets
Fixed maturity securities, bonds available-for-sale	30,304	29,941
Recurring \| Level 2 \| U.S. states and political subdivisions
Financial assets
Fixed maturity securities, bonds available-for-sale	1,078,917	1,078,165
Recurring \| Level 2 \| Foreign governments
Financial assets
Fixed maturity securities, bonds available-for-sale	6,432	6,287
Recurring \| Level 2 \| Corporate debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	5,265,871	5,531,776
Recurring \| Level 2 \| Residential mortgage-backed securities
Financial assets
Fixed maturity securities, bonds available-for-sale	29,585	23,943
Recurring \| Level 2 \| Collateralized debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	15,875	10,129
Recurring \| Level 3
Financial assets
Fixed maturity securities, bonds available-for-sale	53,390	44,844
Equity securities	463	463
Options	125,988	256,005
Short-term investments	0	0
Separate account assets	0	0
Separately managed accounts	50,583	50,503
Total financial assets	230,424	351,815
Financial liabilities
Embedded derivative for equity-indexed contracts	630,952	731,552
Separate account liabilities	0	0
Total financial liabilities	630,952	731,552
Recurring \| Level 3 \| Common stock
Financial assets
Equity securities	463	463
Recurring \| Level 3 \| Preferred stock
Financial assets
Equity securities	0	0
Recurring \| Level 3 \| U.S. treasury and government
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 3 \| U.S. states and political subdivisions
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 3 \| Foreign governments
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 3 \| Corporate debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	53,390	44,844
Recurring \| Level 3 \| Residential mortgage-backed securities
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Recurring \| Level 3 \| Collateralized debt securities
Financial assets
Fixed maturity securities, bonds available-for-sale	0	0
Nonrecurring
Financial assets
Carrying value of bonds held-to-maturity	8,554,809	8,631,261
Fair value of bonds held-to-maturity	8,501,656	8,968,690
Total financial assets	14,110,841	14,158,438
Total financial assets	14,429,823	14,707,855
Financial liabilities
Total financial liabilities	10,398,972	10,412,956
Total financial liabilities	10,398,972	10,412,956
Nonrecurring \| Level 2 \| U.S. states and political subdivisions
Financial assets
Carrying value of bonds held-to-maturity	155,151	165,109
Fair value of bonds held-to-maturity	159,929	170,114
Nonrecurring \| Level 2 \| Foreign governments
Financial assets
Carrying value of bonds held-to-maturity	3,899	3,907
Fair value of bonds held-to-maturity	4,419	4,349
Nonrecurring \| Level 2 \| Corporate debt securities
Financial assets
Carrying value of bonds held-to-maturity	8,011,160	8,099,098
Fair value of bonds held-to-maturity	7,956,612	8,424,969
Nonrecurring \| Level 2 \| Residential mortgage-backed securities
Financial assets
Carrying value of bonds held-to-maturity	179,084	237,516
Fair value of bonds held-to-maturity	186,919	242,828
Nonrecurring \| Level 2 \| Collateralized debt securities
Financial assets
Carrying value of bonds held-to-maturity	205,515	125,631
Fair value of bonds held-to-maturity	193,777	126,430
Nonrecurring \| Level 3
Financial assets
Mortgage loans on real estate, net allowance	5,125,365	5,097,017
Mortgage loans on real estate, net allowance	5,497,500	5,309,005
Policy loans	380,084	379,657
Policy loans	380,084	379,657
Separately managed accounts	50,583	50,503
Separately managed accounts	50,583	50,503
Financial liabilities
Investment contracts	10,242,029	10,254,959
Investment contracts	10,242,029	10,254,959
Notes payable	156,943	157,997
Notes payable	$ 156,943	$ 157,997

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