Goodwill (Carrying Amount of Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Beginning balance	$ 1,144,166	$ 1,113,005
Acquisitions	4,014	36,806
Foreign currency translation	2,728	(5,017)
Other adjustments		(628)
Ending balance	1,150,908	1,144,166
Title Insurance and Services
Goodwill [Line Items]
Beginning balance	1,097,401	1,066,240
Acquisitions	4,014	36,806
Foreign currency translation	2,728	(5,017)
Other adjustments		(628)
Ending balance	1,104,143	1,097,401
Specialty Insurance
Goodwill [Line Items]
Beginning balance	46,765	46,765
Acquisitions	0	0
Foreign currency translation	0	0
Other adjustments		0
Ending balance	$ 46,765	$ 46,765