Liability for Unpaid Claims and Claim Adjustment Expenses - Summary of Incurred and Paid Claims Development as Supplementary Information - Credit Health (Detail) $ in Thousands	Dec. 31, 2019 USD ($) claim	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Claims Development [Line Items]
Liabilities for claims and claim adjustment expenses, net of reinsurance	$ 995,986
Credit Health
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	19,895
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance	14,769
All outstanding liabilities before period one, net of reinsurance	0
Liabilities for claims and claim adjustment expenses, net of reinsurance	5,126
Credit Health | Accident Year 2015
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	3,028	$ 3,036	$ 3,072	$ 3,089	$ 3,162
IBNR plus expected development	$ 19
Cumulative number of reported claims | claim	3,259
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance	$ 2,943	2,864	2,669	2,254	$ 1,082
Credit Health | Accident Year 2016
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	4,029	3,914	3,975	4,323
IBNR plus expected development	$ 90
Cumulative number of reported claims | claim	3,593
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance	$ 3,630	3,330	2,745	$ 1,300
Credit Health | Accident Year 2017
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	4,773	4,852	4,555
IBNR plus expected development	$ 162
Cumulative number of reported claims | claim	3,771
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance	$ 4,058	3,328	$ 1,389
Credit Health | Accident Year 2018
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	4,163	4,631
IBNR plus expected development	$ 280
Cumulative number of reported claims | claim	3,520
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance	$ 2,930	$ 1,473
Credit Health | Accident Year 2019
Claims Development [Line Items]
Incurred claims and allocated claim adjustment expenses, net of reinsurance	3,902
IBNR plus expected development	$ 610
Cumulative number of reported claims | claim	2,268
Cumulative paid claims and allocated claim adjustment expenses, net of reinsurance	$ 1,208