Goodwill (Carrying Amount of Goodwill by Reportable Segment) (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Line Items]
Balance at December 31, 2019	$ 1,150,908
Acquisitions	241,016
Dispositions	(358)
Foreign currency translation	(2,980)
Balance at June 30, 2020	1,388,586
Title Insurance and Services
Goodwill [Line Items]
Balance at December 31, 2019	1,104,143
Acquisitions	241,016
Dispositions	(358)
Foreign currency translation	(2,980)
Balance at June 30, 2020	1,341,821
Specialty Insurance
Goodwill [Line Items]
Balance at December 31, 2019	46,765
Acquisitions	0
Dispositions	0
Foreign currency translation	0
Balance at June 30, 2020	$ 46,765