Goodwill, Finite-Lived, and Indefinite-Lived Intangibles - Finite-Lived and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2009
Finite-lived intangible assets:
Finite-lived intangible assets, gross	$ 140,731	$ 134,806		$ 140,731
Accumulated amortization	(91,419)	(83,926)		(91,419)
Finite-lived intangibles, net	49,312	50,880		49,312
Indefinite-lived intangibles:
Amortization of acquired intangible assets	2,700		$ 2,400	7,900	$ 7,100
EbixHealth JV
Indefinite-lived intangibles:
Impairment of intangible asset		6,200
Customer relationships
Indefinite-lived intangibles:
Customer/territorial relationships	16,647	21,647		16,647
Customer relationships | E-Z Data
Indefinite-lived intangibles:
Indefinite-lived intangible assets recognized						$ 14,200
Reclassified intangible as finite-lived				$ 14,200
Finite-lived intangible asset, useful life				15 years
Customer relationships
Finite-lived intangible assets:
Finite-lived intangible assets, gross	102,436	96,616		$ 102,436
Customer relationships | EbixHealth JV
Indefinite-lived intangibles:
Finite-lived intangible asset, useful life				10 years
Developed technology
Finite-lived intangible assets:
Finite-lived intangible assets, gross	20,243	19,867		$ 20,243
Dealer network
Finite-lived intangible assets:
Finite-lived intangible assets, gross	6,548	6,653		6,548
Airport contracts
Finite-lived intangible assets:
Finite-lived intangible assets, gross	4,451	4,523		$ 4,451
Indefinite-lived intangibles:
Finite-lived intangible asset, useful life				9 years
Trademarks
Finite-lived intangible assets:
Finite-lived intangible assets, gross	2,694	2,700		$ 2,694
Store networks
Finite-lived intangible assets:
Finite-lived intangible assets, gross	2,401	2,440		$ 2,401
Indefinite-lived intangibles:
Finite-lived intangible asset, useful life				5 years
Brand
Finite-lived intangible assets:
Finite-lived intangible assets, gross	882	896		$ 882
Indefinite-lived intangibles:
Finite-lived intangible asset, useful life				15 years
Non-compete agreements
Finite-lived intangible assets:
Finite-lived intangible assets, gross	724	759		$ 724
Indefinite-lived intangibles:
Finite-lived intangible asset, useful life				5 years
Database
Finite-lived intangible assets:
Finite-lived intangible assets, gross	212	212		$ 212
Indefinite-lived intangibles:
Finite-lived intangible asset, useful life				10 years
Backlog
Finite-lived intangible assets:
Finite-lived intangible assets, gross	$ 140	$ 140		$ 140