Revenue - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($)
Contract With Customer Asset And Liability [Line Items]
Current contract assets	$ 61,032,000	$ 61,032,000	$ 50,386,000
Non-current contract assets	50,901,000	50,901,000	$ 38,956,000
Increase of contract assets due to new business generation		88,234,000
Adjustment of contract assets due to estimation of revenue from performance obligations satisfied in previous periods		16,899,000
Payments received from insurance carriers		47,639,000
Profit share
Contract With Customer Asset And Liability [Line Items]
Increase of contract assets due to new business generation		$ 49,673,000
Number of new certified loans | loan		79,726
Contract with customer, asset, price per loan		$ 623
Adjustment of contract assets due to estimation of revenue from performance obligations satisfied in previous periods		16,899,000
Payments received from insurance carriers		44,863,000
Profit share | COVID-19
Contract With Customer Asset And Liability [Line Items]
Payments received from insurance carriers	$ 24,900,000	$ 44,900,000