Condensed Consolidated Statements of Comprehensive Income (Loss) Unaudited - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 11,803	$ 6,122	$ 17,837	$ (7,037)
Other Comprehensive Income (Loss):
Net foreign currency translation gain (loss), net of tax of $0, $0, $0 and $0, respectively	2,184	(3,221)	12,808	(6,693)
Amortization of actuarial losses for retirement plans included in net periodic pension cost, net of tax of $664, $650, $1,330, and $1,301 respectively	1,877	1,885	3,829	3,813
Other Comprehensive Income (Loss)	4,061	(1,336)	16,637	(2,880)
Comprehensive Income (Loss)	15,864	4,786	34,474	(9,917)
Comprehensive (income) loss attributable to noncontrolling interests and redeemable noncontrolling interests	53	(153)	9	(1,912)
Comprehensive Income (Loss) Attributable to Shareholders of Crawford & Company	$ 15,811	$ 4,939	$ 34,465	$ (8,005)