Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Summary of Impact of LDTI on Previously Reported Consolidated Statement of Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Direct premiums	$ 3,312,125	$ 3,230,120	$ 3,122,148
Ceded premiums	(1,651,811)	(1,629,892)	(1,616,264)
Net premiums	1,660,314	1,600,228	1,505,884
Commissions and fees	950,416	944,676	1,042,813
Investment income net of investment expenses	201,311	156,987	142,795
Interest expense on surplus note	(65,474)	(63,922)	(62,207)
Net investment income	135,837	93,065	80,588
Realized investment gains (losses)	(645)	1,444	4,665
Other investment gains (losses)	(5,251)	(2,439)	1,207
Investment gains (losses)	(5,896)	(995)	5,872
Other, net	75,020	83,159	74,575
Revenues	2,815,691	2,720,133	2,709,732
Benefits and expenses:
Benefits and claims	642,979	632,403	602,007
Future policy benefits remeasurement (gain) loss	(384)	1,626	1,297
Amortization of deferred policy acquisition costs	275,816	261,629	238,270
Sales commissions	457,444	462,764	522,308
Insurance expenses	235,460	235,405	202,605
Insurance commissions	34,222	30,261	34,532
Contract acquisition costs	55,233	68,431	52,788
Interest expense	26,594	27,237	30,618
Goodwill impairment loss		60,000	76,000
Loss on extinguishment of debt			8,927
Other operating expenses	336,647	320,394	296,851
Total benefits and expenses	2,064,011	2,100,150	2,066,203
Income before income taxes	751,680	619,983	643,529
Income taxes	175,079	152,953	167,544
Net income	576,601	467,030	475,985
Net loss attributable to noncontrolling interests		(5,038)	(1,377)
Net income attributable to Primerica, Inc.	$ 576,601	$ 472,068	$ 477,362
Earnings per share attributable to common stockholders:
Basic earnings per share	$ 15.97	$ 12.37	$ 12.03
Diluted earnings per share	$ 15.94	$ 12.33	$ 11.99
Weighted-average shares used in computing earnings per share:
Basic	35,954	37,997	39,530
Diluted	36,027	38,106	39,652
Accounting standards update [extensible enumeration]	us-gaap:AccountingStandardsUpdate201812Member	us-gaap:AccountingStandardsUpdate201812Member
As Previously Reported [Member]
Revenues:
Direct premiums		$ 3,230,120	$ 3,122,148
Ceded premiums		(1,629,892)	(1,616,264)
Net premiums		1,600,228	1,505,884
Commissions and fees		944,676	1,042,813
Investment income net of investment expenses		156,987	142,795
Interest expense on surplus note		(63,922)	(62,207)
Net investment income		93,065	80,588
Realized investment gains (losses)		1,444	4,665
Other investment gains (losses)		(2,439)	1,207
Investment gains (losses)		(995)	5,872
Other, net		83,159	74,575
Revenues		2,720,133	2,709,732
Benefits and expenses:
Benefits and claims		665,749	722,753
Amortization of deferred policy acquisition costs		356,143	251,179
Sales commissions		462,764	522,308
Insurance expenses		235,405	202,605
Insurance commissions		30,261	34,532
Contract acquisition costs		68,431	52,788
Interest expense		27,237	30,618
Goodwill impairment loss		60,000	76,000
Loss on extinguishment of debt			8,927
Other operating expenses		320,394	296,851
Total benefits and expenses		2,226,384	2,198,561
Income before income taxes		493,749	511,171
Income taxes		125,775	139,191
Net income		367,974	371,980
Net loss attributable to noncontrolling interests		(5,038)	(1,377)
Net income attributable to Primerica, Inc.		$ 373,012	$ 373,357
Earnings per share attributable to common stockholders:
Basic earnings per share		$ 9.77	$ 9.41
Diluted earnings per share		$ 9.74	$ 9.38
Weighted-average shares used in computing earnings per share:
Basic		37,997	39,530
Diluted		38,106	39,652
Adoption Impacts [Member]
Benefits and expenses:
Benefits and claims		$ (33,346)	$ (120,746)
Future policy benefits remeasurement (gain) loss		1,626	1,297
Amortization of deferred policy acquisition costs		(94,514)	(12,909)
Total benefits and expenses		(126,234)	(132,358)
Income before income taxes		126,234	132,358
Income taxes		27,178	28,353
Net income		99,056	104,005
Net income attributable to Primerica, Inc.		$ 99,056	$ 104,005
Earnings per share attributable to common stockholders:
Basic earnings per share		$ 2.6	$ 2.62
Diluted earnings per share		$ 2.59	$ 2.61
Weighted-average shares used in computing earnings per share:
Accounting standards update [extensible enumeration]		us-gaap:AccountingStandardsUpdate201812Member