Segment and Geographic Information - Revenues and Long-lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues before reimbursements	$ 1,047,627	$ 1,122,979	$ 1,163,709
Crawford TPA Solutions
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues before reimbursements	1,005,802	1,070,971	1,105,832
Long-lived assets	200,224	106,513	131,488
Crawford TPA Solutions | U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues before reimbursements	569,205	615,687	653,693
Long-lived assets	140,560	88,157	111,688
Crawford TPA Solutions | U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues before reimbursements	126,337	131,651	139,338
Long-lived assets	20,749	7,631	7,747
Crawford TPA Solutions | Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues before reimbursements	114,438	121,076	110,962
Long-lived assets	17,999	7,553	8,771
Crawford TPA Solutions | All Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues before reimbursements	195,822	202,557	201,839
Long-lived assets	$ 20,916	$ 3,172	$ 3,282