Segment information - Selected Statement of Operations and Income Information Related to Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 2,257,341	$ 3,069,296	$ 3,305,792
Depreciation and amortization	62,447	57,178	36,386
Interest	19,737	18,403	5,031
Income before taxes	60,861	232,652	433,971
Title
Segment Reporting Information [Line Items]
Revenues	1,977,128	2,733,744	3,002,949
Depreciation and amortization	35,000	29,715	21,227
Interest	1,442	386	3
Income before taxes	97,524	255,132	440,462
Real estate solutions
Segment Reporting Information [Line Items]
Revenues	263,681	296,702	265,497
Depreciation and amortization	25,802	25,563	14,071
Interest	239	0	0
Income before taxes	8,680	16,624	12,951
Corporate and other
Segment Reporting Information [Line Items]
Revenues	(3,468)	38,850	37,346
Depreciation and amortization	1,645	1,900	1,088
Interest	18,056	18,017	5,028
Income before taxes	$ (45,343)	$ (39,104)	$ (19,442)