Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Summary of Impact on Previously Reported Condensed Consolidated Statement of Income (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenues:
Direct premiums	$ 817,872	$ 798,666
Ceded premiums	(405,347)	(399,885)
Net premiums	412,525	398,781
Commissions and fees	231,547	251,800
Investment income net of investment expenses	47,500	34,420
Interest expense on surplus note	(16,435)	(15,515)
Net investment income	31,065	18,905
Realized investment gains (losses)	(985)	577
Other investment gains (losses)	(3,623)	174
Investment gains (losses)	(4,608)	751
Other, net	19,507	20,989
Revenues	690,036	691,226
Benefits and expenses:
Benefits and claims	168,702	168,288
Future policy benefits remeasurement (gain) loss	(508)	(1,272)	$ (500)
Amortization of deferred policy acquisition costs	67,358	63,223
Sales commissions	110,874	133,924
Insurance expenses	61,125	59,509
Insurance commissions	8,138	7,721
Contract acquisition costs	14,984	20,649
Interest expense	6,690	6,853
Other operating expenses	89,536	86,435
Total benefits and expenses	526,899	545,330
Income before income taxes	163,137	145,896
Income taxes	38,031	33,512
Net income	125,106	112,384
Net income (loss) attributable to noncontrolling interests		(2,655)
Net income attributable to Primerica, Inc.	$ 125,106	$ 115,039
Earnings per share attributable to common stockholders:
Basic earnings per share	$ 3.39	$ 2.92
Diluted earnings per share	$ 3.38	$ 2.91
Weighted-average shares used in computing earnings per share:
Basic	36,710	39,221
Diluted	36,804	39,332
Accounting standards update [extensible enumeration]	us-gaap:AccountingStandardsUpdate201812Member
As Previously Reported [Member]
Revenues:
Direct premiums		$ 798,666
Ceded premiums		(399,885)
Net premiums		398,781
Commissions and fees		251,800
Investment income net of investment expenses		34,420
Interest expense on surplus note		(15,515)
Net investment income		18,905
Realized investment gains (losses)		577
Other investment gains (losses)		174
Investment gains (losses)		751
Other, net		20,989
Revenues		691,226
Benefits and expenses:
Benefits and claims		187,069
Amortization of deferred policy acquisition costs		86,063
Sales commissions		133,924
Insurance expenses		59,509
Insurance commissions		7,721
Contract acquisition costs		20,649
Interest expense		6,853
Other operating expenses		86,435
Total benefits and expenses		588,223
Income before income taxes		103,003
Income taxes		24,239
Net income		78,764
Net income (loss) attributable to noncontrolling interests		(2,655)
Net income attributable to Primerica, Inc.		$ 81,419
Earnings per share attributable to common stockholders:
Basic earnings per share		$ 2.07
Diluted earnings per share		$ 2.06
Weighted-average shares used in computing earnings per share:
Basic		39,221
Diluted		39,332
Adoption Impacts [Member]
Benefits and expenses:
Benefits and claims		$ (18,781)
Future policy benefits remeasurement (gain) loss		(1,272)
Amortization of deferred policy acquisition costs		(22,840)
Total benefits and expenses		(42,893)
Income before income taxes		42,893
Income taxes		9,273
Net income		33,620
Net income attributable to Primerica, Inc.		$ 33,620
Earnings per share attributable to common stockholders:
Basic earnings per share		$ 0.85
Diluted earnings per share		$ 0.85
Weighted-average shares used in computing earnings per share:
Accounting standards update [extensible enumeration]		us-gaap:AccountingStandardsUpdate201812Member	us-gaap:AccountingStandardsUpdate201812Member