Segment and Geographic Information-Revenues by Service Line (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
service_line
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Revenue from External Customer [Line Items]      
Revenues before reimbursements $ 1,170,385 $ 1,142,851 $ 1,163,445
Garden City Group      
Revenue from External Customer [Line Items]      
Number of service lines | service_line 1    
U.S. Services      
Revenue from External Customer [Line Items]      
Revenues before reimbursements $ 242,488 215,385 203,916
U.S. Services | U.S. Claims Field Operations      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 78,166 96,390 103,594
U.S. Services | U.S. Technical Services      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 28,558 24,822 28,209
U.S. Services | U.S. Catastrophe Services      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 76,441 43,656 36,067
U.S. Services | Subtotal U.S. Claims Services      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 183,165 164,868 167,870
U.S. Services | U.S. Contractor Connection      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 59,323 50,517 36,046
Broadspire      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 293,032 268,890 252,242
Broadspire | Workers' Compensation, Disability, and Liability Claims Management      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 121,875 112,334 107,624
Broadspire | Medical Management      
Revenue from External Customer [Line Items]      
Revenues before reimbursements 156,290 140,903 128,802
Broadspire | Risk Management Information Services      
Revenue from External Customer [Line Items]      
Revenues before reimbursements $ 14,867 $ 15,653 $ 15,816