Net Income (Loss) Attributable to Shareholders of Crawford & Company per Common Share - Schedule of Shares Issued and Included in Weighted-average Common Shares used to Compute Basic and Diluted Earnings per Share (Details) - Class A Non-Voting - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CRD-A Issued under the Non-Employee Director Stock Plan
Share-based Compensation Arrangement
Shares issued repurchased activity	(7)	4	85	67
CRD-A Issued under the U.K. ShareSave Scheme
Share-based Compensation Arrangement
Shares issued repurchased activity	64		65	1
2016 Omnibus Stock and Incentive Plan [Member]
Share-based Compensation Arrangement
Shares issued repurchased activity	(18)		(18)