Condensed Consolidated Statements of Comprehensive Income (Loss) - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 78,764	$ 97,872
Unrealized investment gains (losses) on available-for-sale securities:
Change in unrealized holding gains (losses) on available-for-sale securities	(164,937)	(64,890)
Reclassification adjustment for investment (gains) losses included in net income	(658)	(468)
Foreign currency translation adjustments:
Change in unrealized foreign currency translation gains (losses)	3,158	4,992
Total other comprehensive income (loss) before income taxes	(162,437)	(60,366)
Income tax expense (benefit) related to items of other comprehensive income (loss)	(35,379)	(14,283)
Other comprehensive income (loss), net of income taxes	(127,058)	(46,083)
Total comprehensive income (loss)	(48,294)	51,789
Net income (loss) attributable to noncontrolling interests	(2,655)
Comprehensive income (loss) attributable to Primerica, Inc.	$ (45,639)	$ 51,789