Net Income (Loss) Attributable to Shareholders of Crawford & Company per Common Share - Schedule of Computations of Basic Net Income Attributable to Shareholders of Crawford & Company per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Class A Non-Voting
Numerator:
Allocation of undistributed earnings	$ 4,967	$ 2,479	$ 6,625	$ (5,960)
Dividends paid	1,849	916	3,700	3,055
Net income (loss) attributable to common shareholders, basic	$ 6,816	$ 3,395	$ 10,325	$ (2,905)
Denominator:
Weighted-average common shares outstanding, basic	30,826	30,521	30,825	30,541
Earnings (loss) per share - basic	$ 0.22	$ 0.11	$ 0.33	$ (0.10)
Class B Voting
Numerator:
Allocation of undistributed earnings	$ 3,617	$ 1,828	$ 4,825	$ (4,400)
Dividends paid	1,347	675	2,694	1,804
Net income (loss) attributable to common shareholders, basic	$ 4,964	$ 2,503	$ 7,519	$ (2,596)
Denominator:
Weighted-average common shares outstanding, basic	22,445	22,510	22,454	22,544
Earnings (loss) per share - basic	$ 0.22	$ 0.11	$ 0.33	$ (0.12)