Revenue - Summary Of Contract Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021
Contract With Customer, Asset [Roll Forward]
Beginning balance	$ 111,933		$ 89,342
Increase of contract assets due to new business generation	51,371		139,605
Adjustment of contract assets due to estimation of revenue from performance obligations satisfied in previous periods	7,515		24,414
Receivables transferred from contract assets upon billing the lending institutions	(21,197)		(56,100)
Payments received from insurance carriers	(35,360)		(82,999)
Ending balance	114,262		114,262
Profit Share
Contract With Customer, Asset [Roll Forward]
Beginning balance	104,886		83,177
Increase of contract assets due to new business generation	27,932	$ 14,700	77,605
Adjustment of contract assets due to estimation of revenue from performance obligations satisfied in previous periods	7,515		24,414
Receivables transferred from contract assets upon billing the lending institutions	0		0
Payments received from insurance carriers	(33,678)		(78,541)
Ending balance	106,655		106,655
TPA Fee
Contract With Customer, Asset [Roll Forward]
Beginning balance	1,099		822
Increase of contract assets due to new business generation	1,801		4,854
Adjustment of contract assets due to estimation of revenue from performance obligations satisfied in previous periods	0		0
Receivables transferred from contract assets upon billing the lending institutions	0		0
Payments received from insurance carriers	(1,682)		(4,458)
Ending balance	1,218		1,218
Program Fee
Contract With Customer, Asset [Roll Forward]
Beginning balance	5,948		5,343
Increase of contract assets due to new business generation	21,638		57,146
Adjustment of contract assets due to estimation of revenue from performance obligations satisfied in previous periods	0		0
Receivables transferred from contract assets upon billing the lending institutions	(21,197)		(56,100)
Payments received from insurance carriers	0		0
Ending balance	$ 6,389		$ 6,389