Segment information - Selected statement of Income Information Related to Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 836,727	$ 595,696	$ 2,344,121	$ 1,551,701
Depreciation and amortization	9,144	5,144	22,394	13,436
Income (loss) before taxes	116,446	76,343	319,904	134,632
Title segment
Segment Reporting Information [Line Items]
Revenues	772,246	567,743	2,157,949	1,506,618
Depreciation and amortization	4,556	3,748	13,579	11,302
Income (loss) before taxes	119,147	82,376	321,910	152,003
Ancillary services and corporate segment
Segment Reporting Information [Line Items]
Revenues	64,481	27,953	186,172	45,083
Depreciation and amortization	4,588	1,396	8,815	2,134
Income (loss) before taxes	$ (2,701)	$ (6,033)	$ (2,006)	$ (17,371)