Segment and Geographic Information (Details)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2015
USD ($)
segment
|
Dec. 31, 2014
USD ($)
|
Dec. 31, 2013
USD ($)
|
| Segment Reporting [Abstract] |
|
|
|
|
| Number of operating segments (segments) | segment |
|
4
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
$ 1,170,385
|
$ 1,142,851
|
$ 1,163,445
|
| Assets |
|
783,406
|
789,319
|
|
| U.S. Services |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
242,488
|
215,385
|
203,916
|
| International |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
506,650
|
488,284
|
488,488
|
| Broadspire |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
293,032
|
268,890
|
252,242
|
| Operating segments |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Segment operating earnings |
|
87,025
|
81,701
|
105,687
|
| Depreciation and amortization |
[1] |
25,983
|
24,283
|
21,807
|
| Assets |
|
591,736
|
591,563
|
608,451
|
| Operating segments | U.S. Services |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
242,488
|
215,385
|
203,916
|
| Segment operating earnings |
|
32,702
|
18,039
|
11,895
|
| Depreciation and amortization |
[1] |
2,780
|
2,415
|
1,822
|
| Assets |
|
49,252
|
46,846
|
47,208
|
| Operating segments | International |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
506,650
|
488,284
|
488,488
|
| Segment operating earnings |
|
18,799
|
25,344
|
38,795
|
| Depreciation and amortization |
[1] |
8,579
|
7,525
|
7,352
|
| Assets |
|
349,358
|
318,689
|
339,435
|
| Operating segments | Broadspire |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
293,032
|
268,890
|
252,242
|
| Segment operating earnings |
|
24,017
|
15,469
|
8,245
|
| Depreciation and amortization |
[1] |
8,841
|
8,448
|
7,381
|
| Assets |
|
105,518
|
103,899
|
109,939
|
| Operating segments | Garden City Group |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Revenues before reimbursements |
|
128,215
|
170,292
|
218,799
|
| Segment operating earnings |
|
11,507
|
22,849
|
46,752
|
| Depreciation and amortization |
[1] |
5,783
|
5,895
|
5,252
|
| Assets |
|
$ 87,608
|
$ 122,129
|
$ 111,869
|
|
|