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SEGMENTS INFORMATION - Revenues by Client Location (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | $ 324,651 | $ 264,482
Reimbursable expenses and other revenues |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 3,925 | 2,446
United States |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 176,830 | 136,639
United Kingdom |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 46,594 | 43,560
Switzerland |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 29,096 | 30,852
Russia |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 13,209 | 8,965
Canada |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 12,494 | 15,846
Germany |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 12,094 | 8,739
Netherlands |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 8,671 | 2,647
Sweden |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 7,466 | 4,128
Hong Kong |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 4,777 | 5,944
United Arab Emirates |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 2,048 | 0
China |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,584 | 294
Ireland |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,389 | 1,186
Italy |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,280 | 668
Denmark |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,253 | 410
Other locations |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | $ 5,866 | $ 4,604

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